Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9776b45735f0d49…

MALICIOUS

PDF

72.7 KB Created: 2021-04-23 20:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87f0b828cebed4940affa40f1e193517 SHA-1: 7c9ed5659d0da2945ce5c9af60df9466d8a83dd2 SHA-256: a9776b45735f0d49f021d3b6a210289e5d68cbbc0174836e5a79816b7d4965fd
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The primary malicious URL identified is dafemum.ru, which is likely used to host or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dafemum.ru/strik?utm_term=fellowes+125ci+shredder+parts+diagram
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/3751210.pdf
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/3656786.pdf
    • https://garanokuwepo.weebly.com/uploads/1/3/0/8/130874617/7357358.pdf
    • http://joblanc.xyz/bisum81ih4.pdf
    • https://nutikatike.weebly.com/uploads/1/3/4/6/134601603/38109e3ed80.pdf
    • https://betivaronapan.weebly.com/uploads/1/3/5/3/135350750/33de4076f05.pdf
    • https://lefawiput.weebly.com/uploads/1/3/5/3/135324435/vesego_mutotodod_golexo_zulanudawi.pdf
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/lumonixoxexit_dapebeziwipo_mosilumitelibi_wujamekize.pdf
    • https://newogofifexepe.weebly.com/uploads/1/3/4/8/134884114/8740119.pdf
    • https://zejenabo.weebly.com/uploads/1/3/0/9/130969472/gimotulaxog.pdf
    • http://good-production9.site/hero_hunters_best_heroeso73o3.pdf
    • http://quickstore.pro/haese_mathematics_myp_3_second_edition_free_downloadeni26.pdf
    • http://gtmedis.com/xivijabumedojabkhn13.pdf
    • http://1xbets-regs.site/80004739977gld8g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_800edded062948679b0084e56bd182ba.pdf?index=true
    • http://dofumuligo.rf.gd/esc_guidelines_myocardial_infarction_2012.pdf
    • http://bogutofiwib.rf.gd/xotekeremakewuvita.pdf
    • https://s3.amazonaws.com/verirejon/internal_audit_report_deloitte.pdf
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_a80fb160d0ee4080996869fa41463ec5.pdf?index=true
    • https://s3.amazonaws.com/fonazuzixagizir/copperplate_guidelines_paul_antonio.pdf
    • http://sonepepebevor.epizy.com/bavokigewasuk.pdf
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_aecd8038a91448f7b3e990a7c2a05544.pdf?index=true
    • http://zifasodokid.epizy.com/dajunodel.pdf
    • https://s3.amazonaws.com/gosete/70693959620.pdf
    • https://s3.amazonaws.com/mupukesunobaga/tijolewavivivigulewov.pdf
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_f5be782b3ef143f28047a06b74f95799.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c9.bin
60701afe706c4163f0cdf9c2d5dd4508cfa4f3a8520350733ec80ba59979fc02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 5844 bytes
font_01_sfnt_off0000ec9d.bin
703a536b244dde8f329425665ab51ae35b6e23db0a4e654d341d65fda1f36226		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 11780 bytes

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