Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a9a74e04a7342f…

MALICIOUS

PDF

83.5 KB Created: 2021-05-03 01:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 967850dac61aa0fd3d6801a96a50b6c2 SHA-1: f58f444e5466b9d8ea24e4aba55f6ec58c836bba SHA-256: b4a9a74e04a7342f9d76039ab1473c1efbfa2feaa7c9e3ffbc3bde868ac594d4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though partially garbled, appears to be a lure related to a research paper, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=yin+2009+case+study+research+design+and+methods+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379032/normal_60691668759af.pdfIn PDF document text
    • https://bixavovene.weebly.com/uploads/1/3/0/7/130775743/rawejetodexosumibo.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/tA8gdTl/mufikulegona.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/zogezanetub.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/behaviorism_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_606cd14c89489.pdfIn PDF document text
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/4517847.pdfIn PDF document text
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/ac4f3aeff0117.pdfIn PDF document text
    • http://lazisirogabidir.mypressonline.com/25083811766.pdfIn PDF document text
    • https://cdn.sqhk.co/logenuzupug/igdhaG2/vovenafutomapijagopufolu.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/taranowewazaxolu.pdfIn PDF document text
    • http://juvugewit.iblogger.org/mumazuxivifazuvuripik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366633/normal_5ff78e268d210.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/gLajjjc/21315384608.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/gdicBnP/bokugoj.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://gilemexuwef.epizy.com/83874614486.pdfIn PDF document text
    • http://jerekapubujiw.rf.gd/9624887918.pdfIn PDF document text
    • http://godusisoti.onlinewebshop.net/eichmann_em_jerusalm_baixar.pdfIn PDF document text
    • http://fewepenemowa.epizy.com/30602711306.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 5912 bytes
SHA-256: 471bad02db61031111386d20d75c4b9f9275be6f24f5bca5b317ba65de245326
font_01_sfnt_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 11000 bytes
SHA-256: c4976a0ab04b36efa3f07f530745193b7b0f4fd4e5a2085e4d995434a2a5cba3
font_02_sfnt_off00013267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13267 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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