Malicious PDF — malware analysis report

Static analysis result for SHA-256 81061404a4925c2e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-15 21:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bd147dd4d1bcfe91377ec9087ca595f6 SHA-1: a7435f101272b8fb13a50c8f5d6419ca1388c82b SHA-256: 81061404a4925c2ed5f042c7ee424b92995dcb7e6e34dc089efdf05f3e2c9984
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with a primary link pointing to 'https://gimoguvi.ru/strik?utm_term=salary+for+health+and+safety+administrator', suggesting a lure to a malicious site. The PDF structure also indicates a link farm, likely intended to distribute further malicious content or redirect users.

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 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.
  • 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://gimoguvi.ru/strik?utm_term=salary+for+health+and+safety+administrator PDF link annotation
    • http://podarokinsta.site/12710251186zqw34.pdfIn PDF document text
    • http://itverys.space/95162384137od0tg.pdfIn PDF document text
    • http://nutristrike-shop.ru/craftsman_lawn_mower_self_propelled_repair1s3o1.pdfIn PDF document text
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/wolovov.pdfIn PDF document text
    • http://navalny.design/what_is_a_blind_nil_in_spades_plus4gvbb.pdfIn PDF document text
    • http://fastpysystem.online/pemobuzizugapewekh0qq8.pdfIn PDF document text
    • http://fruit-italy.space/zabogiminuseniguwijape7yap2.pdfIn PDF document text
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/kosuwev-kefur.pdfIn PDF document text
    • https://gefusuteluvis.weebly.com/uploads/1/3/4/5/134595196/zamadugepuki.pdfIn PDF document text
    • http://com-signto2.xyz/9662280085380fdi.pdfIn PDF document text
    • http://dvertsoff.ru/quantitative_techniques_for_business_decisions_m.comabtwt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/66356760396.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_ba2329b4f7b04fb8b253f0149be5ee82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sisaxu/12121723682.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/bifuf.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/hurtta_sele_storleksguide.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_321f8261cbe642268c1c51884dfb1c1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toguvaju/fidupe.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/vanovudobikem.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_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 5352 bytes
SHA-256: 0014912c734b9a3d1e4cc269415db7016faff32544623c61e11cd3b68bad1519
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 11820 bytes
SHA-256: a7d338616749a671f7ab5cba0b727348d7e5a83698a614f255b4b23ba6da2fb3

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