Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f6aaecd9db8132…

MALICIOUS

PDF

71.7 KB Created: 2021-02-21 20:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2dca3768849c9da84aad90dddd55d334 SHA-1: 8ccfee5c1abb32a8c32a771fc7ea8c98314b3b92 SHA-256: 54f6aaecd9db8132fb0c3d4fac990b6428865b2dae2585fa90a628954f6e4001
186 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 disposable domains, indicating a link farm or SEO spam operation. ClamAV and ML classifiers identified the file as malicious, specifically as a phishing or trojan PDF. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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.
  • 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://jacksth.ru/wix?keyword=keto+in+five+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392853/normal_6018b858bb7e2.pdfIn PDF document text
    • http://memubalejegezur.66ghz.com/80040234471.pdfIn PDF document text
    • https://nelejejo.weebly.com/uploads/1/3/4/8/134883178/wigesegabuvajotolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5fd2ad91ab0c5.pdfIn PDF document text
    • http://pogofefopi.22web.org/59929464372.pdfIn PDF document text
    • https://zupufirelerige.weebly.com/uploads/1/3/0/9/130969681/4594457.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_5fe45a6293cd8.pdfIn PDF document text
    • https://wexasubofuxumeb.weebly.com/uploads/1/3/2/7/132740188/6642191.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/db118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500447/normal_601d982b3bf4d.pdfIn PDF document text
    • http://lireveputejat.iblogger.org/iodine_clock_reaction_post_lab_answers.pdfIn PDF document text
    • https://xanipopig.weebly.com/uploads/1/3/5/3/135345317/8445909.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5fcbca0cee955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409395/normal_6002ee7a183af.pdfIn PDF document text
    • http://mumokajepuxu.iblogger.org/rerogevudebedolim.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/807307.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://borinalujid.epizy.com/software_for_windows_10.pdfIn PDF document text
    • http://tekoboworitutew.epizy.com/limiting_factors_worksheet_answers_yellow_perch.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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 4644 bytes
SHA-256: 964e8e67f6b77b225753bb934f8116a579b41cf63d805c3205ba6639e0078eec
font_01_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 10340 bytes
SHA-256: 3ce3535643e80dbaf60f53bf8ab4bff74f344683dc50c854912696a2b7b7f2d9

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