Malicious PDF — malware analysis report

Static analysis result for SHA-256 d259f3e820381259…

MALICIOUS

PDF

71.8 KB Created: 2021-02-22 13:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4def533081f4f7ed2c70617849e4b628 SHA-1: 21ca893a73c06b16d5c651ff2dce1b5f3dbf2354 SHA-256: d259f3e8203812593ace0333eb49119270919cd56ab3c4c42f12c59123c7ec64
146 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness with high probability. The presence of numerous external URIs, some hosted on disposable domains and configured as link farms, strongly suggests a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document content is designed to trick users into calling a phone number, a common tactic in tech-support scams or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bologen.ru/aws?utm_term=how+to+pair+hang+up+speaker PDF link annotation
    • https://cdn.sqhk.co/woteruzid/TcwiisX/packers_vs_chiefs_score_tonight.pdfIn PDF document text
    • https://vemomomofaj.weebly.com/uploads/1/3/2/7/132740815/7748202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490265/normal_5fc8cf25005d0.pdfIn PDF document text
    • http://triple-doska6.club/28702474465vk0uj.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/binuzazogal.pdfIn PDF document text
    • http://ubzvp.com/sumimipnfbw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453743/normal_602269329f693.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5ffcf081d1cc0.pdfIn PDF document text
    • http://fdvsefwfrw.space/composition_of_transformations_worksheet_keyajiax.pdfIn PDF document text
    • https://vewenaloviriwu.weebly.com/uploads/1/3/2/8/132816087/95838b17f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392472/normal_5ff6710b4928e.pdfIn PDF document text
    • http://vovality.club/2004_lamborghini_gallardo_0-604w5b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_602926cbbd14d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 5168 bytes
SHA-256: c71247a8011ac5bf18f086b43f779d64d6b0204ae52ecd6068a11e50d0ba4226
font_01_sfnt_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 12116 bytes
SHA-256: 4a241255324e32a495901d86c1ae205d57f45179136a0a0b8263ee858a982288

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