Malicious PDF — malware analysis report

Static analysis result for SHA-256 8073f4eab7e2b9e4…

MALICIOUS

PDF

81.3 KB Created: 2021-03-02 23:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6a52b3a529d36f72d6cd10e22b81679 SHA-1: 8911401f89c1dd370df0900ee2072c571ed33fd1 SHA-256: 8073f4eab7e2b9e4641461b116822434a3585549d2e6c0fbd45831f7b8c5d517
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm or SEO spamming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://resalured.ru/strik?utm_term=types+of+figurative+language+and+their+meanings
    • https://cdn-cms.f-static.net/uploads/4406782/normal_6033c54e59609.pdf
    • http://jinunagavep.iblogger.org/79186771854.pdf
    • https://cdn-cms.f-static.net/uploads/4486971/normal_60247e7beb93a.pdf
    • https://cdn-cms.f-static.net/uploads/4472208/normal_603b955287dc1.pdf
    • https://static.s123-cdn-static.com/uploads/4403683/normal_6001f689dfa29.pdf
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/5803549.pdf
    • https://cdn-cms.f-static.net/uploads/4463812/normal_600a0581f2a35.pdf
    • https://cdn-cms.f-static.net/uploads/4421613/normal_601aee7f550aa.pdf
    • https://vatizojisizekig.weebly.com/uploads/1/3/4/8/134852150/8550664.pdf
    • https://cdn-cms.f-static.net/uploads/4404296/normal_601b835872edc.pdf
    • https://static.s123-cdn-static.com/uploads/4378175/normal_6002a65fd4bd7.pdf
    • https://gaturipagi.weebly.com/uploads/1/3/0/7/130739573/mepaser.pdf
    • http://wajufogisabo.iblogger.org/arbeitszeitgesetz_zusammenfassung.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vamanufa.rf.gd/dowusoxafoguzaka.pdf
    • http://zinolaj.rf.gd/guwugusixalotixivudoxu.pdf
    • https://s3.amazonaws.com/muxozuvalubi/homelite_5_ton_electric_log_splitter_manual.pdf
    • https://s3.amazonaws.com/dutimajizowa/publisher_bookmark_template.pdf
    • https://s3.amazonaws.com/sajatesawodiji/bijafomavimafera.pdf
    • https://s3.amazonaws.com/midipes/barbell_bicep_curl_correct_form.pdf
    • http://gadoxijumulop.epizy.com/75932727709.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_off0000ffb8.bin
382b208f6368ad4cc23882b87e2aca6fc1fdf278abfaa2073a972c94f51117f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 5568 bytes
font_01_sfnt_off0001128c.bin
73d4f06b7e7f6fbc185d84cfb8bc39a156afa60db18406341d4e7e5beaecff05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 11028 bytes

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