Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8ae07882e9a2dd…

MALICIOUS

PDF

66.2 KB Created: 2021-10-01 08:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4d20c16abb839517e955b86d2e3d7098 SHA-1: 9f74ee2aeef63806a112924c37586e27d897748b SHA-256: fe8ae07882e9a2ddd53ff568e1f22f1def78271d8f5030189494cf685811d89e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=lover+reborn+read+online PDF link annotation
    • https://ecoquimica.cl/dinamicos/uploads/file/xisoxu.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/nadakajepajonaripibozux.pdfIn PDF document text
    • http://fohow77.ru/upload/file/fiwutalikijufoguv.pdfIn PDF document text
    • https://ms2oke.com/contents/files/soveliwowisi.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/7095098837.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/pidirifiwutivan.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/57287225571.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/wekajabolojilamiwowatag.pdfIn PDF document text
    • https://upaspor.com/resimler/files/82145789696.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/zaloxunumix.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/63541139172.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/89935824109.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA158 10136 bytes
SHA-256: 930ba2969b8e3b9d612e14e50707d6c82fb992cd33e8f3545deb2cf2f4363e5c
font_01_sfnt_off0000b7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FF 16772 bytes
SHA-256: 9a6e91f37cdad8cc5314814a5490f5af2434b12366f88f720abd603a08278158
font_02_sfnt_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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