Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c40239e074e5a91…

MALICIOUS

PDF

74.1 KB Created: 2021-03-03 01:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d8c2f845d434f28670c727388daeac82 SHA-1: 54b8d6f9c615112e1a49c37cde1d7e2619afc2e3 SHA-256: 5c40239e074e5a91f2edc5fe6255855b9c0e6d95ebc6856a237d07b8c3394060
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=my+pet+dog+essay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5fd9caf558491.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/how_old_is_my_ducane_ac_unit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486201/normal_60067a91c94cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_603c1d3f3398a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_60133a9e99c5f.pdfIn PDF document text
    • https://vadutivolojogo.weebly.com/uploads/1/3/0/8/130813650/kosimubusi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_5ffef2add15c1.pdfIn PDF document text
    • https://lefesime.weebly.com/uploads/1/3/4/8/134882546/giwugoxivefofu.pdfIn PDF document text
    • http://momarivido.mypressonline.com/zegomixijuvatewasupiro.pdfIn PDF document text
    • https://pifaxatopegamu.weebly.com/uploads/1/3/4/1/134108845/wizena.pdfIn PDF document text
    • https://tuvuneboginat.weebly.com/uploads/1/3/1/6/131606819/05a6b558ed24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446765/normal_600bc4c7ea52c.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/muwupajomem_kawakuvusi_zekepukabunex_bexijoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5fd236bb8ea2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/what_1991_baseball_cards_are_worth_money.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/vuridojedibezidazowilurov.pdfIn PDF document text
    • http://gaxodusipif.epizy.com/weekly_task_planner_template.pdfIn 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_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 5108 bytes
SHA-256: 5f632a1e6a6554efcb9d4b2d5bded0ab858030b06784920962d333830087dae4
font_01_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 10180 bytes
SHA-256: 8ee6ee164129bdf8e0fa5e2ac54a45613b31a988f39551c7684b2e219c83941f

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