Malicious PDF — malware analysis report

Static analysis result for SHA-256 be798c1177050b68…

MALICIOUS

PDF

73.7 KB Created: 2021-01-18 17:34:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5a8c40869645465f0ac63a8bc87e90b3 SHA-1: bb213e59c6267134669323c5b94473c0f914382a SHA-256: be798c1177050b68b27d5a1b3b0f28dc38b658eb175eb02bf1e04d8a25dbfede
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafffe.ru/123?utm_term=acid+base+indicators+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386594/normal_5fecafc543658.pdfIn PDF document text
    • https://site-1168079.mozfiles.com/files/1168079/carnage_battle_arena.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/Yhimbhf/mojijafekime.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/vugaxisa-sobifof-sisunubebifuxuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/rozovasiveb.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/55947562375.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/bonepavitamapakukos.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/veranulubamusezava.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/regenojemibefibogixonove.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/49434108206.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_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 5280 bytes
SHA-256: c91d41ef1d7c74dcbc7e39d83a8257afbd8355f001a8a80a5b3a6a7fd702420c
font_01_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 10224 bytes
SHA-256: 3be514bb6706af8dfe29925b73a2578a699d2c9c0815b73dd9021d7587ed1107

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