Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e368568ee8bfc77…

MALICIOUS

PDF

82.5 KB Created: 2021-03-23 20:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bea1efcd1066448f573d60d474ed9398 SHA-1: 07597d6cba0c9684747b94f1773bd3725c768f82 SHA-256: 6e368568ee8bfc770b4f9d37bcca0082e68d582f4bdf3356b1a5f9f891c2c02e
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://pelibifir.ru/award?keyword=bible+verses+about+faith+in+hard+times+pdf PDF link annotation
    • http://nudistoff.club/tinuzisodazevobhylg.pdfIn PDF document text
    • https://bugupomulu.weebly.com/uploads/1/3/5/3/135396692/sedibeturi_pemojawajub_paxaribuj_zegorojulinin.pdfIn PDF document text
    • https://kutekedutowake.weebly.com/uploads/1/3/4/6/134635623/f98a493675ee3f9.pdfIn PDF document text
    • http://bubble1.space/how_to_cook_potstickers_on_stovewx6bg.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/how_much_notice_should_you_give_for_a_letter_of_recommendationv63m5.pdfIn PDF document text
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/ledasud-fadebuga.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/7f64c5b3630e.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/84024538875.pdfIn PDF document text
    • http://operationhomeplate.com/34422409490xyxuu.pdfIn PDF document text
    • http://sait-ok.ru/11025439225nizwb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://velosipu.epizy.com/ejemplo_de_dialogo_formal_en_frances.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_d746c18cfe344886977676c3e034b3f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekife/karyotype_lab_worksheet.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_bdfb45ac567f48f7a2f0549ddfc15847.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_97fc5aef402640408ebbb643eff36cc2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/49194511591.pdfIn PDF document text
    • http://jefuxod.epizy.com/storyboard_template_16x9.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/84706467490.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_3e63cd4b9d594316b0635c9014780d9e.pdf?index=trueIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_a79de0ebbe3a477682e9ab678a718726.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_f8769bc85b734e6abd0c67708202ca9c.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 5412 bytes
SHA-256: df4b03d0e4217990f9debda05b8cf21f672fe70513f56a651ebe7fd26b780dd3
font_01_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 10844 bytes
SHA-256: d9d7928609353ff2f05b0397153e010fc9c7cb82e84f96487046adda9b459933
font_02_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333