Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f234b4d73fbefe7…

MALICIOUS

PDF

72.8 KB Created: 2020-12-16 16:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e40bd9824df70b983b5891e91c259802 SHA-1: fc624d61b38d2c95239f01c5e36a25a2ae8cb8ec SHA-256: 8f234b4d73fbefe7759dbe49ff0126e90600960e7b759b3352ca317ef22e8a44
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'traffmen.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier strongly indicates maliciousness, and ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'Factors affecting rate of reaction', likely a lure.

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
  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=factors+affecting+rate+of+reaction In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f9a1b801f158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_5f9350f4f058d.pdfIn PDF document text
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/punawebomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_5f97c0cdecb72.pdfIn PDF document text
    • https://sasikivi.weebly.com/uploads/1/3/4/4/134462450/0d5916d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f935e356aa11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445325/normal_5fd3852e96464.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/00c51f28-caa7-44cc-93c8-d84abfe506f6/xupotoli.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7144deddbb05c68932ff1/t/5fcb79b11ef6d1662fef1e24/1607170481711/galulivagomimibodudes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc779a1b2e29c7ba9943e48/t/5fcaf29b9708706f39920b41/1607135899950/tales_of_crestoria_japanese_tier_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/59372826587.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a7518651a04751993a6e/t/5fcc2d6b9aa2de0c648470eb/1607216504296/lojaxasivujovokoxoj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36eb77848ba205d28ae0c/t/5fc61c3a9ee0f32b8724a936/1606818875042/ice_cream_cone_cake_baskin_robbins.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e80068612547ed5e2b99/t/5fc32801cb3e0f5771b7934e/1606625282327/wokaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 4760 bytes
SHA-256: 846cd6d8827d7d6e833eb734a617dbb1f3f020ab46da8a3e1af311e0e72b2850
font_01_sfnt_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 10744 bytes
SHA-256: 6d116e1e84357ba857df076357dacbe7328d4e4205024f44aa040580136f0a43
font_02_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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