Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93376bb60af7540…

MALICIOUS

PDF

100.6 KB Created: 2021-01-10 16:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a644c490f7701eeb53c99ed427069127 SHA-1: 8b7596e4be66efe7820ee0fef1f354e97689af92 SHA-256: a93376bb60af754082eae6915280af34609a4783e02d4f2b869f840e85dc8577
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

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 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://traffking.ru/123?utm_term=the+catcher+in+the+rye+time+setting PDF link annotation
    • https://site-1173632.mozfiles.com/files/1173632/23661597766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5f87aaedf0415.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/hiKih7d/snapple_flavors_of_the_90s.pdfIn PDF document text
    • https://site-1173634.mozfiles.com/files/1173634/dark_riddle_mod_apk_3__3__11.pdfIn PDF document text
    • https://site-1173607.mozfiles.com/files/1173607/badupe.pdfIn PDF document text
    • https://site-1176409.mozfiles.com/files/1176409/9043130134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444098/normal_5fe0375dc9476.pdfIn PDF document text
    • https://site-1176800.mozfiles.com/files/1176800/xinumavuni.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/g2ii0ov/design_my_room_for_me.pdfIn PDF document text
    • https://site-1177444.mozfiles.com/files/1177444/8486396301.pdfIn PDF document text
    • https://site-1175190.mozfiles.com/files/1175190/xumenu.pdfIn PDF document text
    • https://cdn.sqhk.co/pofevadamem/cF0hehd/4401788683.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_off00014db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB6 5232 bytes
SHA-256: 08bf34009061647bba18c766066d8c57928a9c78da4378c42fc27b32526d478c
font_01_sfnt_off00015f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F64 11088 bytes
SHA-256: aa6141a409637531bb60f73d0e0cafa4aea1f3143e81ea06ce2d67085a35e930

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