Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac23a3990f46ace…

MALICIOUS

PDF

68.7 KB Created: 2021-02-21 19:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f3412e28977772b302d5aaa0e5636072 SHA-1: 1d9ed92ec088e1cf30b93fd70e7b14c445c6fd26 SHA-256: 1ac23a3990f46aced8a7ef35807dbd148cbd2f6aa5f37e8ecab8d9a4981013f6
126 Risk Score

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 hosting and are used in a link farm pattern, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be an attempt to disguise the malicious content as a user manual, likely to trick the user into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=panasonic+kx-tga101s+user+manual PDF link annotation
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/xuratapakobepasinira.pdfIn PDF document text
    • http://bisipatelaloguj.66ghz.com/electrical_brochure_design_template_free.pdfIn PDF document text
    • https://mubuwevuli.weebly.com/uploads/1/3/4/5/134528176/boxob-nukafoxufefiri.pdfIn PDF document text
    • http://marikafemijo.22web.org/14295688909.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383917/normal_5ffadaeb73fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450243/normal_60311be926cf8.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/warifejuloweku.pdfIn PDF document text
    • https://zokofefedepop.weebly.com/uploads/1/3/1/4/131437243/sesozonim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373516/normal_5ff82b0204f90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watijosanowo.epizy.com/aliens_of_the_deep_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/investment_memorandum_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/34813544023.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/17696574067.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_off0000cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 5480 bytes
SHA-256: b65d257e41b56b93311448ddb6f47b795587a54b9cf44c68addd46761ac86124
font_01_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 11888 bytes
SHA-256: 1c7fc74fa1d583b05c36c6cd859937e80f5bdee73f5f0990ed60f1a911067314

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