Malicious PDF — malware analysis report

Static analysis result for SHA-256 d923265fe6725f7e…

MALICIOUS

PDF

82.6 KB Created: 2021-05-20 12:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b26c4ff439e995729db94f12311329dd SHA-1: 7ab1b964afdc06dcdd6d82d6a247821f59b6ba12 SHA-256: d923265fe6725f7e32d425aae87bd2157189c931eb6bd08df118578519bcecc6
134 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple embedded URLs, including one pointing to 'druttle.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further suggesting malicious intent. No scripts were extracted, but the document's structure and embedded links strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://druttle.ru/strik?utm_term=how+to+transfer+line+chat+from+ios+to+android
    • https://static.s123-cdn-static.com/uploads/4407087/normal_60082a4656828.pdf
    • https://fusorebumobem.weebly.com/uploads/1/3/3/9/133986296/572537.pdf
    • https://static.s123-cdn-static.com/uploads/4365619/normal_60090ca9ac5b1.pdf
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/jatizi.pdf
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/980ba1cf3b9f45.pdf
    • https://cdn-cms.f-static.net/uploads/4458625/normal_605d9ad08aca0.pdf
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/bee54428c4.pdf
    • https://mevusaku.weebly.com/uploads/1/3/4/7/134721943/pagonijonerizu.pdf
    • https://cdn-cms.f-static.net/uploads/4367925/normal_60609a2b05094.pdf
    • https://xegunato.weebly.com/uploads/1/3/4/3/134315925/towovesevi-xiruz.pdf
    • https://cdn-cms.f-static.net/uploads/4390996/normal_601a63023054b.pdf
    • https://pigabatanez.weebly.com/uploads/1/3/1/3/131380253/2129024.pdf
    • https://cdn-cms.f-static.net/uploads/4407304/normal_5fd65e55a5055.pdf
    • https://cdn-cms.f-static.net/uploads/4496404/normal_606134d9c29ae.pdf
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/70d676f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b76062c4-8135-4f4e-9b40-4ad943de5640/96591947438.pdf
    • https://uploads.strikinglycdn.com/files/78a615e0-4717-49b4-9188-decfae8c14a0/how_to_open_honeywell_chronotherm_iii.pdf
    • https://s3.amazonaws.com/daselex/54941418966.pdf
    • https://s3.amazonaws.com/kisimujuk/17825041730.pdf
    • https://uploads.strikinglycdn.com/files/5fba1677-7d55-4380-b3ff-bc79bf20ffb3/36992266325.pdf
    • https://uploads.strikinglycdn.com/files/ad485291-0bf1-4482-a98f-e87b9ab04d63/romeo_and_juliet_act_1_scene_5_comprehension_questions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010346.bin
4a97e3a5c5ccd16711064e318583edeb23f1fb7d9aa610005af9fd7da87a005c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 5316 bytes
font_01_sfnt_off00011535.bin
58d39cc4f8f68f48335e98ecc32b3b94107fa02ef92b0fde80b1da43f9c351f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 11140 bytes

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