Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8b7542a4351a93…

MALICIOUS

PDF

82.2 KB Created: 2021-03-04 11:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 23ee405ca77a9c29c63f634e55e12e3a SHA-1: 67a1ab9d814a8c686809db8e5c19990b5aa016b5 SHA-256: 6c8b7542a4351a93c7bd227b39b3fe285068f04b2ca3b3c98b1ba180f637913a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to contain search-like queries, suggesting a lure to external malicious sites. The presence of external URIs and the link farm heuristic indicate a strong intent to redirect users to potentially harmful content.

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://ponafet.ru/award?keyword=what+is+the+lowest+sat+score+for+harvard PDF link annotation
    • http://ozalupa.space/heizer_y_render_2009cqd18.pdfIn PDF document text
    • http://bumaga.bz/what_is_the_best_electric_lawn_mower_to_buy685iz.pdfIn PDF document text
    • http://nonly.xyz/65542201408vf80.pdfIn PDF document text
    • http://strapslap.online/lp_hematocheziaei9hp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_601db30233b10.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/ha4jhE9/ice_scream_3_horror_neighborhood_download.pdfIn PDF document text
    • http://idealicait.website/optimist_or_pessimist_testwq8mb.pdfIn PDF document text
    • http://alania365.ru/37070878014vpa1z.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/jTTTChb/football_soccer_leagues.pdfIn PDF document text
    • http://obmenkalnr.online/betimigigulofozefetodejix9ljx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_60068dd726e31.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/3jiGhh8/foldersync_app_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5ff201f26f5d8.pdfIn PDF document text
    • http://myyshooop227.site/yamaha_saltwater_series_225l6o3o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/anzca_malignant_hyperthermia_guidelines.pdfIn PDF document text
    • http://fufagarafe.epizy.com/kaxibetijenigisesor.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_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 5276 bytes
SHA-256: 09c89aa080d27135df49248c36287d0746b84f85af2ebc7686b0f4e8e9f0baef
font_01_sfnt_off0001185c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 10364 bytes
SHA-256: a40cadace5f9c49aca5f19e8938a599226837e901401d20a4beb82285d7c6012

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