Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0d170df52d1033…

MALICIOUS

PDF

99.5 KB Created: 2021-03-24 18:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea4b69b6aaeb8463e57a09b2ad371a03 SHA-1: 21f858bb50bf78a4bab4545bf86b33ecbade0412 SHA-256: 8e0d170df52d1033753ec5d93b63a1886a096da508a3c4580e5834cf25201812
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a mass external link farm, with the primary malicious URL being https://seumenha.ru/strik. The document body, though heavily obfuscated, suggests a lure related to book information, likely to trick users into clicking the malicious link. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=how+to+look+up+a+book%2527s+dewey+decimal+number
    • http://livelaj.iblogger.org/the_education_of_a_value_investor_book_free_download.pdf
    • https://cdn.sqhk.co/jexumumir/jaRgfib/wizard_wars_multiplayer_duel_apk.pdf
    • http://nomevojererekan.22web.org/breville_juice_fountain_cold_plus_recipes.pdf
    • https://cdn.sqhk.co/gogojelawov/jcpt3kc/evoland_legendary_edition_ps4.pdf
    • https://cdn.sqhk.co/xurakipigub/bAgcH6V/ayyappan_baby_songs_tamil.pdf
    • http://pedefep.22web.org/jutanaxafujuzomekexuwud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_a389a5899ab34a428cf9b597658a5efa.pdf?index=true
    • https://s3.amazonaws.com/makumapikeze/amazon_sale_bed_sheets.pdf
    • https://s3.amazonaws.com/zijivevip/vishnu_sharma_panchatantra_stories_in_english.pdf
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_0c7f4c7c19c641c8ac9f66908a109d00.pdf?index=true
    • http://vudidesodus.epizy.com/livro_data_science_do_zero.pdf
    • http://gopuvobapeten.rf.gd/zabivatoxixeg.pdf
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_c757c6bdaf4748f19e2130a31ddb3699.pdf?index=true
    • https://s3.amazonaws.com/wusone/pemojugidu.pdf
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_8616e84555f24d3e9814f963b0169573.pdf?index=true
    • https://s3.amazonaws.com/xozeb/python_classification_report_support.pdf
    • https://5a840009-9758-4786-9341-86142d54ca6e.filesusr.com/ugd/3254bf_675dd039099a4b1b892e931948bd2c9a.pdf?index=true
    • https://s3.amazonaws.com/nabifovu/vinobabufozigomatodig.pdf
    • https://s3.amazonaws.com/sazomo/plantronics_voyager_legend_charging_case_user_guide.pdf
    • https://3557a179-a1ee-4801-a209-85ad6f504536.filesusr.com/ugd/9c409a_0a472ca93e71459c84f7e51ee11e6c16.pdf?index=true
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_7bb22a8834ea4a27a4aa6ca794eb51e6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132c9.bin
e0d9c280b597db1dead759ccdfe8d59b1e15369f04b4d9d82cdee0f9bb3d38be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 5612 bytes
font_01_sfnt_off000145dc.bin
a399a50b4e70b1c78de18d336c2348bc5efd0133618a0f60e954f03acdaf7843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145DC 10792 bytes
font_02_sfnt_off00016ac9.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC9 16204 bytes

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