Malicious PDF — malware analysis report

Static analysis result for SHA-256 988479716c424dfd…

MALICIOUS

PDF

64.6 KB Created: 2020-12-03 19:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d6c27e9e9fe00bfb04e5263aa460cf SHA-1: d2df3980178ad982dfabb006893f311ead153313 SHA-256: 988479716c424dfdf4a6baa3b54a168a2dcc540da1a90b042a7609bf540584e8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, a common tactic for phishing or SEO spam. One of the extracted URLs, 'https://traffking.ru/aws?utm_term=barska+scope+manual', is flagged as unknown reputation and is likely part of the malicious infrastructure. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/aws?utm_term=barska+scope+manual
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f87541f14130.pdf
    • https://cdn-cms.f-static.net/uploads/4475719/normal_5fb810d00f2d8.pdf
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/4254576.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/ziruvenerosifa_pepukumuwojupov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/405f23de-794e-4a00-a89a-a4238d504d0c/the_haskell_school_of_expression.pdf
    • https://uploads.strikinglycdn.com/files/990fd86d-de89-4eae-8495-9643043c6007/spotted_tailed_quoll_husbandry_manual.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6aabe18c5c478ef48182/1606380207401/doleki.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0cf4f81c9a2a0c699ada/1606290677179/nefipum.pdf
    • https://s3.amazonaws.com/rupatojuko/julius_caesar_act_3_questions_and_answers.pdf
    • https://static1.squarespace.com/static/5fc06ecff7cf8c75402886b4/t/5fc1ac4b9d79364840ccbd6c/1606528076787/32488977817.pdf
    • https://static1.squarespace.com/static/5fc0eab716f6d44b07bedc8b/t/5fc353427acac6192a2aceda/1606636354650/dolare.pdf
    • https://uploads.strikinglycdn.com/files/39b119e8-65e2-4fd5-aa7a-fabd7d0a1349/67769045553.pdf
    • https://static1.squarespace.com/static/5fc0b544c89e1c4b8fbd6471/t/5fc1a8bae18c5c478e39fcc1/1606527162531/90372385.pdf
    • 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_off0000bf84.bin
ab22eb95d461799eb6eec3f8c97fa79a1c7515cf84b69686f4af9d2b3e05b24d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 5192 bytes
font_01_sfnt_off0000d11c.bin
a4d9e65a0778407668176dd2f398a2a54e4144f3debf6c74a2636e02cc031597		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 10684 bytes

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