Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1ae25011e3cd72…

MALICIOUS

PDF

82.5 KB Created: 2021-04-06 17:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c3b652e0958f56744902b02d18f76de9 SHA-1: 24fb91b73cf056a6a0a3e28eb21baf5af37ce002 SHA-256: 9b1ae25011e3cd72e8faa4f2705f643964877c737c24f07e15ce1c03f5686dc4
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The document body, though heavily obfuscated, suggests a lure related to a 'Eureka vacuum cleaner repair manual'. The presence of external URIs and link farm characteristics indicates an attempt to redirect the user to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=eureka+vacuum+cleaner+repair+manual PDF link annotation
    • http://medebux.22web.org/woxulogatirevixose.pdfIn PDF document text
    • https://cdn.sqhk.co/wolowivem/hijjSiG/gatovepetawobokutakuside.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/geographic_information_system.pdfIn PDF document text
    • https://cdn.sqhk.co/siboxowimu/ia5hhha/microsoft_stream_app.pdfIn PDF document text
    • https://parimuxuroz.weebly.com/uploads/1/3/2/6/132682994/5325e0716f2f4b.pdfIn PDF document text
    • https://bavifogo.weebly.com/uploads/1/3/4/5/134524367/3210963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fd8fb37331a3.pdfIn PDF document text
    • http://kdghy.online/black_and_decker_grass_hog_batteryimx20.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/jffvXxM/ice_cream_horror_adventure_2.pdfIn PDF document text
    • https://jopixedojowagi.weebly.com/uploads/1/3/4/8/134852439/masimamorakufajoz.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/what_are_the_difference_between_doodle_fiction_manga_and_graphic_novelpdotw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_6058bd64338a9.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/cihDhdA/game_maker_studio_2_crack_mac.pdfIn PDF document text
    • http://iranomics.com/foniwugovavuriygu1q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/catholic_youth_bible.pdfIn PDF document text
    • http://kejinimijenemav.epizy.com/vezenewumisagafirofuride.pdfIn PDF document text
    • http://mafokesa.onlinewebshop.net/62814948858.pdfIn PDF document text
    • http://bixodog.rf.gd/28160848256.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_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 4984 bytes
SHA-256: cd8035f3cbc271da433a5357353a43051f7d8ba5c25c1e6f22904621f6ff8583
font_01_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 10928 bytes
SHA-256: 4a7e55cd7a36fdad7dac05207b9c3ee9ab23d36516bd5b905d171acf2ae24ffe

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