Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f075c833e65ca5a…

MALICIOUS

PDF

81.7 KB Created: 2021-02-25 05:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ce38fdfe0659bb5d134dacee8bfe0116 SHA-1: edc4f9665ab6303e10aedfa3dfc444edcb22b26b SHA-256: 4f075c833e65ca5a26f84079f71dc7bf5edff57bf1bfc4e19001b8c21693d10c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and redirectors, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a URL that appears to be a lure for information gathering or further exploitation.

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://leonvi.ru/strik?utm_term=how+to+put+bluetooth+headphones+in+discovery+mode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448535/normal_600fd5f7448c6.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/jenokiwugu.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/hhsNhjW/ags_world_history_textbook_answers.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/fallout_4_mods_without_bethesda_account.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/d4j7mvs/boeing_747_supertanker_price.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/40512758531.pdfIn PDF document text
    • https://cdn.sqhk.co/lalamiteliw/fL6jhXe/57652752907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463526/normal_6001fad22553d.pdfIn PDF document text
    • http://eduha.online/b_n_college_patna_admission_form_2017qlanz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_600b62096069d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jawuguv.epizy.com/how_to_study_12th_physics.pdfIn PDF document text
    • http://zigubogujivo.epizy.com/kowagufiluwomaz.pdfIn PDF document text
    • http://robireroruvudi.epizy.com/english_learning_classes_for_adults.pdfIn PDF document text
    • http://neduweleviwov.rf.gd/sexefiwakenaxod.pdfIn PDF document text
    • http://majilutiwuxas.rf.gd/mivirojazokifijuluzijuko.pdfIn PDF document text
    • http://zoxizagujaniru.epizy.com/christmas_movie_quotes_answers.pdfIn PDF document text
    • http://gumupomomoripu.rf.gd/mail._ru_apk_latest_version.pdfIn PDF document text
    • http://fugovolit.rf.gd/14880489950.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/sibawiguverokojoluwafo.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_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 5668 bytes
SHA-256: 1dd4ec12fbc10d14abbecc4ab38cd2492ead94d1f7c5b0a39678ee1f63602046
font_01_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 10732 bytes
SHA-256: a11aa3a583af41488cf0c6346d9e035b6f059a3f4bcc63166019cd482ece60ea

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