Malicious PDF — malware analysis report

Static analysis result for SHA-256 599b6bcf8f42d6d7…

MALICIOUS

PDF

76.4 KB Created: 2021-03-10 22:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dfb511d2288d66ce5524d3f28f97f21d SHA-1: a8a4320f0e7d3d0e775cd3a9da17edc4e89778c1 SHA-256: 599b6bcf8f42d6d77521644d0d81d46a5f89929d8f20aa7a9c475950c2cdf5f4
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://mezovuduw.ru/123?utm_term=lagu+broods+heartlines+acoustic PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470832/normal_60485eed57834.pdfIn PDF document text
    • http://liko-sneakers.com/jugozibolulgyh75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fcc8e4dcb868.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fc88b8f1272a.pdfIn PDF document text
    • http://changely.club/will_they_remake_mgs1rds6l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_602fa719cfdbb.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/iAngdA9/32128924146.pdfIn PDF document text
    • http://tuimag.ru/426536600885gapm.pdfIn PDF document text
    • https://cdn.sqhk.co/vorowobenune/cieVdVB/download_ragdoll_arena_mod_apk.pdfIn PDF document text
    • http://kmikaerfs.ru/48522397153jl2i1.pdfIn PDF document text
    • http://inglassrus.ru/14565604579a4go7.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/GSibxQp/nasulotevaxipabusagodof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5fd2332733a01.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/66931399037.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/best_location_for_antenna_amplifier.pdfIn PDF document text
    • https://cdn.sqhk.co/daluzowinasu/eJjaGzy/78361473906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454821/normal_6007e0761cc38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5ff4ce8104fed.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/fjbiJgh/kanegivin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_977085090c014d538c23a924d18e53b4.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_f8202c3cae6f4d6e8163ab54fef0c4ea.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_3f9e048f577349dcbb5739c6215fe061.pdf?index=trueIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_2a3a57fea2644029af877a9e430c1fdb.pdf?index=trueIn 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_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 5280 bytes
SHA-256: 4aa08b43e705931d6a526f5be6bb78e5efcf02746e37f9e47f7d2cb2b1496a71
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 10688 bytes
SHA-256: 9dbee928bc3addf0f4fe405cafb8ea7b56121e63fb69c0bf0d5ea83c597b418a

Open this report in the interactive analyzer, or submit your own file for analysis.