Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef86043b9f586ce0…

MALICIOUS

PDF

73.6 KB Created: 2021-03-01 15:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 447e47f907a78122fd66ab762b964d2a SHA-1: fbc27a3bbdc4c813fb8bf0ff5c8aac3ad0328237 SHA-256: ef86043b9f586ce064462938670e71b9bff065a0ed674ccaf77b2ea2e7a31bab
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7791

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/award?keyword=foodsaver+v3840+instructions PDF link annotation
    • http://world-wildshop.com/87579374406jn1qu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5fe8d7e097f79.pdfIn PDF document text
    • http://gelchlen.fun/65588347543007y0.pdfIn PDF document text
    • https://cdn.sqhk.co/sitosuduf/cjajamS/space_race_multiplication_math_game.pdfIn PDF document text
    • http://robolab.one/gerogsc524.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5fe3bd525cea0.pdfIn PDF document text
    • http://igafnd.org/13780594058nx9r.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/A2Tggij/msx_emulator_retropie.pdfIn PDF document text
    • http://ladidoxa.iblogger.org/ligusatod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/75776463837.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/rekexo.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/bifiv.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/boxexa.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 5504 bytes
SHA-256: 2390e85ed749464a44fa3b577d4a9116488ce8f352c3e9c978825df1160144f6
font_01_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 21868 bytes
SHA-256: bc3bd19641026a088f525caaf5f66b4dc8fdd4698280c331df024be24c381f74

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