Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92f4d23b65b75aa…

MALICIOUS

PDF

68.6 KB Created: 2020-11-19 06:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5536e478bfb2fbcb39e3c0757a9baf36 SHA-1: 0bb0c30383694768b5debe3c822d9de0726c3823 SHA-256: a92f4d23b65b75aab2a14f4b48f72c9d8b93b21c9613cbc89e2fae313b3a969a
174 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number intended for callback phishing or a tech-support scam. While no scripts were extracted, the embedded URL points to a suspicious domain, suggesting a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=va+claim+pros+reddit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5f9235ba5a57a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_5f9c28a08d106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f880abf7508a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5f9d4059bb843.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/kudefem/wowajatokoniso.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/gewajo.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/68740386121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e56f5a-3c08-4dc6-aa16-0b849a700878/rinunumuz.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/18141143364.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/tezizuforozadesiromizagu.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_off0000cf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 5184 bytes
SHA-256: 3878571d382a0fa110798f621071204af583d97e4db39f5367ceb8b97a288d4a
font_01_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 10416 bytes
SHA-256: 79492e9db153e39f396a93f59394ed05b214bb4aa8eaed9516bcf3297e149aa2

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