Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b90c09a95b9791…

MALICIOUS

PDF

71.1 KB Created: 2020-12-17 19:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1c6cef3b51a7d3e220f36fa5c2cd4ac SHA-1: 7d0b69859e55c013aa1c2b7af04be8b62f40b95a SHA-256: a5b90c09a95b979164dda49548f571293cd723605455ccb611cf35a801a3c01d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to contain search-related terms, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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 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.
  • 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/strik?utm_term=denver+north+carolina+zip+code
    • https://fadexawotizetav.weebly.com/uploads/1/3/4/3/134339615/zibazepilikevulus.pdf
    • https://wanuvimuz.weebly.com/uploads/1/3/4/4/134462356/nazal_xoruzed_zimakimekejiwor.pdf
    • https://zikenanevo.weebly.com/uploads/1/3/4/5/134589255/ac167cf3ed190.pdf
    • https://bimenejujuw.weebly.com/uploads/1/3/4/5/134592033/3229346.pdf
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/kewipo-jofepunapuwele-dejiluve-wujefizobododa.pdf
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/17267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc50aa38139af03765fbccb/t/5fd0bba5cb6bfe602c572952/1607515045361/24317567974.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf633c1972c46e3c96a1bd/1606378314991/zero_reject_entitled_students_to_what.pdf
    • https://uploads.strikinglycdn.com/files/112399bb-7fbd-4315-ab4a-cc7175e49c66/dopirufim.pdf
    • https://s3.amazonaws.com/kakef/2004_acura_mdx_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/377e479f-c607-4e32-acf3-b79f2e8b7917/star_wars_in_skyrim.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_off0000db1e.bin
7fb74ef50c3c6092cb541d08847c8ab86b6dc8ba7184f21e144062831e365095		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 5092 bytes
font_01_sfnt_off0000ec80.bin
5465c0334eb2d8df3ddb6130b3efa02c3f8774c854cd4b54f693c6cf56a4d8a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 10500 bytes

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