Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9a5f82382be72a…

MALICIOUS

PDF

79.7 KB Created: 2021-02-16 10:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d4f319c8d22403088ffdb9df681e024c SHA-1: bb0eaa98f4cd66c90e710e9a823f9060929165ee SHA-256: 6a9a5f82382be72aec54fdd61a6c9ca722f57a2cdc6cef337023b8e22850d30b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, indicates a lure related to a 'user manual', aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=moto+g6+play+user+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fccd2531e0fb.pdfIn PDF document text
    • http://electriccannoz.club/jegowaxufititizidaxufen42phd.pdfIn PDF document text
    • http://komarovskii.xyz/manual_machinist_jobs_bcvzvtf.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/ibmijZB/13818903878.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/iiidHgf/nibedivofisase.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/hapbiji/padirosapodaxixaxunig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupomejov.epizy.com/36803055278.pdfIn PDF document text
    • http://desuvusemexemob.epizy.com/51322739068.pdfIn PDF document text
    • http://zorogeloma.epizy.com/activator_office_2016_kmspico.pdfIn PDF document text
    • http://zopefunexot.epizy.com/33999675263.pdfIn PDF document text
    • http://panaxeberagi.epizy.com/arsenic_poisoning_case_report.pdfIn PDF document text
    • http://poserub.rf.gd/wirepe.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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 3724 bytes
SHA-256: ce22c8eaa1f53a77d563481fc3f0abc202627ce0e69ac912df19b60822d178aa
font_01_sfnt_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 5620 bytes
SHA-256: e55ffe3d65c6709d2264494e30e967ca153eca2f5b48302a15607422f3b128c2
font_02_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 13284 bytes
SHA-256: cb15bd13955feb3a1be56bb6af2cfcb699d522ab14a84db3205ec778f6ec11c4

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