Malicious PDF — malware analysis report

Static analysis result for SHA-256 191898f1c88a0a19…

MALICIOUS

PDF

102.9 KB Created: 2021-03-05 09:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 487ddd6811fd2ac71700388d75692e9c SHA-1: 4d273e2fc0825da77924cfdaeb0995456af6b831 SHA-256: 191898f1c88a0a19cc9fec3d1d4b9806b5e3495a0a7768b2f3a92c694f3135a7
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also assigned a high probability of maliciousness. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the presence of numerous external links points to a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wb?keyword=what%20does%20feliz%20navidad%20mean%20in%20english In PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/wuvijozanumebumelisa.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/what_is_the_best_portable_cd_player_on_the_market.pdfIn PDF document text
    • http://autokenn.com/33981389438ydear.pdfIn PDF document text
    • http://setofexperience.site/quick_video_recorder_mod_apkbv9v8.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/does_the_military_get_federal_holidays_off.pdfIn PDF document text
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/99b54785b79c7.pdfIn PDF document text
    • https://pawudovavumub.weebly.com/uploads/1/3/1/4/131411600/dumezevajunaz-powiwoweru-nisazu.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/e5875c.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/bc980b90.pdfIn PDF document text
    • http://helpcontactform.com/does_hulu_have_the_shining3u0ow.pdfIn PDF document text
    • http://clubstore.pro/lanejibesokagenigovottx25u.pdfIn PDF document text
    • http://momentikshop.space/rusch_baby_food_processor_manuald98ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1423d5-711b-48d9-a17c-708749ae4667/how_to_use_ge_advantium_oven.pdfIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_c660b14772594090b3553dd362304e2f.pdf?index=trueIn PDF document text
    • http://jabodegodonirad.atwebpages.com/dunkin_donuts_stockton_ca.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_f871a3a40786482dbbc68a8561096a98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42901d1d-8920-4627-a6da-c5331d8df765/monster_nicki_minaj_rap_verse.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_186da1fcd99449c5a8a675f614e2c5f7.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_d47e8e09a63241ff892811a35c92bbdb.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_12a65216f6204b86bb698e042c6b4b07.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off000164f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x164F4 17600 bytes
SHA-256: e75f6a5f6e71355ec9932de19e470bfc0e3e2d17ba2883747805b492086863f9
font_00_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 3316 bytes
SHA-256: e7a87e54b4cda1357f9ef814def81c4904b357a23fde3434078ffeda77b7841a
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 5348 bytes
SHA-256: b1321dd2d67d358b0af1a3edc9bc7c5150af4f1b3973fcf2fd245fa7a0c57cb6
font_02_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 2656 bytes
SHA-256: 1620336da6018abf771a3b64a4739dbc5cc5761e5bcfd31f9568e9163b5e6178
font_03_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 2328 bytes
SHA-256: 6d897259d7ab9db79b0dbb16904cd99ff486aa7f4a475590a5d3e44eab6e0eed
font_04_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 2108 bytes
SHA-256: b3976ad28991401f3a7e0d936621f3963ed8fd81aff5bedc9e25cf6548b1959b
font_05_sfnt_off00012833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12833 5916 bytes
SHA-256: b459021cfb41aa88514fe4971dd2f7bafb4fc6be14c7f4cda23728a915056a65
font_06_sfnt_off00013749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13749 15356 bytes
SHA-256: 43f96dff411c3bb3a0372a51c995a408f07edb21197449c69961af7cd5c358b5
font_08_sfnt_off00017fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC9 2832 bytes
SHA-256: ab0b30550c16f0218ea180a56450acc25083be48fb805cb0f6f475dfa13b8319

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