Malicious PDF — malware analysis report

Static analysis result for SHA-256 73df66de26c67458…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 14:01:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: d535278fde7753a7f11675e605a7fe76 SHA-1: 5805acabd3f4192887f66309d611561c7112c1d7 SHA-256: 73df66de26c67458447cc052e81c41ca622c2844d2d9996dadd25b0eb2b4a588
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing attempt. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to distribute malware. The document body, though truncated, suggests a lure related to a "premium bios update", aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://kuzutuzo.ru/strik?utm_term=p6x58d+premium+bios+update PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481662/normal_6018447471c7a.pdfIn PDF document text
    • https://sowovejapa.weebly.com/uploads/1/3/4/7/134709895/kojimutaziz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_601128a32d4cb.pdfIn PDF document text
    • https://jetukuzimol.weebly.com/uploads/1/3/2/6/132695660/11333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_605277ab3cb56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444648/normal_6005b6dc46c32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471969/normal_5fe84dc3949d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494433/normal_603fd9e43c8f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499309/normal_6008fde7290c3.pdfIn PDF document text
    • https://mozufakumijisa.weebly.com/uploads/1/3/5/3/135333945/8986433.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/igfiajf/valufalurewilos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wivufaw.epizy.com/after_we_collided_book_price.pdfIn PDF document text
    • http://vivizegijarugip.epizy.com/bluetooth_device_for_windows_8_free.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_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 5752 bytes
SHA-256: 5981c135b1022547fbb1019e49ae2eb925fbcf530ff659f60289cd1efeb6e394
font_01_sfnt_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 10972 bytes
SHA-256: bfbfbfb51e53c1a3e03fb6be0cc5093b68068b226b7b16dd52e6f4fc9a287e87

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