Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d13feb97e948936…

MALICIOUS

PDF

74.4 KB Created: 2021-02-08 02:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 87d44ad9a18992e90b60388b554ac161 SHA-1: 14e441658f2e42b05cbbf2b2c13b68471b4cf891 SHA-256: 3d13feb97e948936a39f3c5f30c258e21dd56e4889629b7c3f78ec2d712a8025
194 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a deceptive lure, such as a fake invoice or payment request, to encourage clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wb?keyword=a%20pro-%20forma%20document PDF link annotation
    • https://xanikijopido.weebly.com/uploads/1/3/4/7/134738407/8751171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_60119810d9b68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473632/normal_60063bb7d49ef.pdfIn PDF document text
    • http://pravagims.net/bolemerufovi879r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_6020143e5b674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5fdb591d777b7.pdfIn PDF document text
    • http://citruss.space/xidisasep26vo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_602026556bef6.pdfIn PDF document text
    • https://difidewuwigexej.weebly.com/uploads/1/3/4/6/134652805/fujaba_tosupuliga.pdfIn PDF document text
    • https://fogurasetaj.weebly.com/uploads/1/3/5/9/135961985/penuxevopixoguluv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419847/normal_5fca7d4ea6e44.pdfIn PDF document text
    • http://ita-bio.fun/conundrum_book_anuj_dhar_freepwiv9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujesotes.epizy.com/ppap_manual_current_edition.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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 5112 bytes
SHA-256: f489e06a85ebff97c961421492d336ec15fbf996dc1ec27530b5f602cfd2cf6a
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 10532 bytes
SHA-256: 728fc4959cc19b5b7144fd5f6c3eed3bd7488a1a3db9cd0f1f2c338b49fbe36f

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