Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3987798bb6e7daf…

MALICIOUS

PDF

79.3 KB Created: 2021-05-16 17:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 80c8ba35cd69bc2079b6e23049ca4b90 SHA-1: 64c2afa303d9422430bd61105474c650f5682b20 SHA-256: b3987798bb6e7daf98d45b6555ad80de4c4ddae61883b01a0eb07990fbff52d6
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=octavia+butler+bloodchild+themes PDF link annotation
    • https://zemijawa.weebly.com/uploads/1/3/1/0/131070152/duzakobivarati_bopexifumeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_606e21d380fba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fcf60701e7c2.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/niRaiba/dominoes_online_multiplayer_board_games.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/idWWyp0/merge_dragons_how_to_get_life_flower_wonder.pdfIn PDF document text
    • https://ziwuvofoxovexo.weebly.com/uploads/1/3/1/1/131163777/zepatesogesu.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/jevunorus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464527/normal_603b313df35a8.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/jcaIjgf/your_guide_world_travel_tour_guides.pdfIn PDF document text
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/rumelunevuw.pdfIn PDF document text
    • https://cdn.sqhk.co/kowipopi/ddhdjbN/75256791314.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/iadXM3G/maternal_movie_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475725/normal_6032f8061f55c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_5fd9447b1620e.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/a638b67b07.pdfIn PDF document text
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/widin.pdfIn PDF document text
    • https://musagitunoton.weebly.com/uploads/1/3/4/3/134368320/7872575657288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_e41f6dc1a1dc4e39a0642266b714ff44.pdf?index=trueIn PDF document text
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_ea08ab11639e4889883eb4ff91307799.pdf?index=trueIn PDF document text
    • https://90138cf2-752b-46b9-a396-1872e0473e42.filesusr.com/ugd/02203e_ee62ce99ce1e4dc997293dce94db601c.pdf?index=trueIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_f640e55cc57d432ea44c678f96854839.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_2056179f50a349f18af04dbf8e9debe1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 5408 bytes
SHA-256: b54ffafcd6e57294160a8d75b3c4d6d701a56a9a9306e40cf5444d8835bd5ab8
font_01_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 11108 bytes
SHA-256: 1ac60073ff0d0c330a05e28ff4920474be1f43bef4ba5aed20a964be6c4ba3e7