Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c4d7bc0db2d90e…

MALICIOUS

PDF

66.9 KB Created: 2020-11-25 21:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ff9ff9df44a13eff1d4fb085f0cd14e8 SHA-1: 6c335f78f56f9359c64d0940821e4019bba489e1 SHA-256: 81c4d7bc0db2d90e71a8c70dd3116bb2b725b45b5e359524828454f28e9902dd
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback lure. The embedded URL `https://traffnew.ru/strik?utm_term=aeropostale+application+forms` is the primary indicator of a potential phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to trick the user into navigating to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/strik?utm_term=aeropostale+application+forms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f94d899d0f62.pdfIn PDF document text
    • https://pisilobeko.weebly.com/uploads/1/3/4/7/134728547/pudelugutijaz.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/6403867.pdfIn PDF document text
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/223137.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/veniwekiwirogotusaru.pdfIn PDF document text
    • https://venifamu.weebly.com/uploads/1/3/4/5/134501621/mibamanifuniw_dasigizi_feborinebofoza.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/7447619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/029f7959-63d6-451f-ab2f-4d20cebbc97b/kamofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fbf4630-9b60-407a-ac46-649c7c875a3e/mepexotofipewag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5fa184e-52c6-4f9b-9205-316ae68c933f/40986499343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd950bb-9823-46f3-ae65-a6b689b6712f/92421508301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c00d31-6fc2-43a8-b8ed-1dd1a3738b1f/free_robux_codes_jan_2020_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 5152 bytes
SHA-256: b77724501c0a3c2382c83104210c58245e5543395edd3d3959212444b9c468b3
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 10964 bytes
SHA-256: 67089e67e8dbb9e6da85d32fe0616da55d9136c4a52ce187cc4cbfaa06c34606

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