Malicious PDF — malware analysis report

Static analysis result for SHA-256 87767d90a71fc9ff…

MALICIOUS

PDF

73.8 KB Created: 2021-02-27 16:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4140cac812813b9156586125b22f7133 SHA-1: 7e633d1acfbfe799ea8ae146307716dcdf7d7704 SHA-256: 87767d90a71fc9ff49c82bc76f23709d5a24b8ee7febd3b8acbbb4b43b8aaf47
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme, potentially leading to phishing or malware distribution sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://zajinet.ru/strik?utm_term=what+does+the+season+finale+of+the+outsider+mean
    • https://walowopus.weebly.com/uploads/1/3/5/2/135295279/cb582d9.pdf
    • https://vetazewufa.weebly.com/uploads/1/3/2/8/132814418/861946aaf4.pdf
    • https://xigologilajuveb.weebly.com/uploads/1/3/4/6/134672854/755029.pdf
    • https://zejotagidegixop.weebly.com/uploads/1/3/4/5/134522105/xiwegujubuvezesef.pdf
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/xejomesekabadufenebe.pdf
    • https://dikasawo.weebly.com/uploads/1/3/5/3/135349802/9532654.pdf
    • https://cdn-cms.f-static.net/uploads/4449998/normal_602d8d42c39b1.pdf
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/dimozuzuru-kipiro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kakekojezutok/vubagobemiren.pdf
    • https://s3.amazonaws.com/sagotomagin/sajakinamosatirivaj.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_off0000e637.bin
e0a88c836714a28581a6aaf8a62ef1bb926b2b80bf9fedf2f4cb3a6dc4751c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 5160 bytes
font_01_sfnt_off0000f7a5.bin
1ed73143655814ace8837c9e728d13d7c59f6380c9bf07702949d53f7bfbdc43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10068 bytes

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