Malicious PDF — malware analysis report

Static analysis result for SHA-256 646ee51125cfac74…

MALICIOUS

PDF

89.2 KB Created: 2021-02-23 03:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4cdb00ac673d185efc2b201d46a8334b SHA-1: 4d3552eb7eeca76f22619edc5f3264e26c99ab3b SHA-256: 646ee51125cfac740ff898e4452f462237b23d10f355c000fc19db49f6a0c0de
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=how+much+is+a+honda+rebel+500 PDF link annotation
    • http://powusonuruw.22web.org/40532468781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486987/normal_60343d2794538.pdfIn PDF document text
    • http://tesodip.iblogger.org/nimekelagafizonupu.pdfIn PDF document text
    • https://cdn.sqhk.co/fujesepulo/iWiLdfE/95012126277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_600eb1cb7589e.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/bgcUheP/raxuzevil.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/Qgcqsib/64164995703.pdfIn PDF document text
    • http://nusamovepi.22web.org/types_of_aquaponics_systems.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/jaagiB2/prison_break_season_1_episode_1_recap.pdfIn PDF document text
    • https://cdn.sqhk.co/wopiwozaso/jghidUj/moksha_yoga_schedule_winnipeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467038/normal_5fe0a00e52f50.pdfIn PDF document text
    • http://didanak.22web.org/sujir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawupegidozu.rf.gd/pugibugufa.pdfIn PDF document text
    • http://kexeban.rf.gd/lulusalefadinopagijulis.pdfIn PDF document text
    • http://denisilexi.rf.gd/kakatow.pdfIn PDF document text
    • http://wogosozado.rf.gd/3601650052.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 5640 bytes
SHA-256: 021957c06df1b37854c6d08ef616aa886a3c3ca417fe8de8273bdfc5d886a716
font_01_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 11264 bytes
SHA-256: b4511eafd67da5c6726a98366664a8ab2d516bb981b7f07848a02aad92f5c15a

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