Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb29da7150591fe…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 16:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d7caf8a94c991cf6bc689ff5f58ec767 SHA-1: c439d6ac0ec37d7d8ba9a13342273f576dea1703 SHA-256: 7fb29da7150591fed7b1d80d4d2e4a7982ce0e77950e401bff244a1a7a3ec0bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which are unknown or potentially malicious, suggesting an attempt to redirect users to phishing sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of distinct hosts were used, characteristic of link farms designed to obscure malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/53184985816.pdf In PDF document text
    • https://skykharchono.mn/editor/files/12096027153.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/60770439957.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/75964697279.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/49997484937.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/57847762988.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fatujuvusov.pdfIn PDF document text
    • https://cartolmania.it/file/mesivabarazosolegov.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/42080076024.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/45491571167.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5cf4c2mll0cq32pdibdr64v2vq/sotobum.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/dewegagibipobale.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/naxuwutifoxineb.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1bf03a116---razasebefaselolu.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/lasazuririzebuwaled.pdfIn PDF document text
    • http://precisao.org/files/files/tolinugofasubenanasavo.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/kigogitumovedomopoba.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/86593104436.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/42550195402.pdfIn PDF document text
    • http://cke.hk/userfiles/faramanorofadaneguz.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/2629974462.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/tubazubifoletun.pdfIn PDF document text
    • https://mattress-leader.com/media/feveboxanidi.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/29779249535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+car+game+namePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 17696 bytes
SHA-256: 662e2b0b1275fd73d2d241f533806c91c210dc466c957dbe7f4efdde07a4f8cf
font_02_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 10368 bytes
SHA-256: 1ac0dbea0778039f49dfdca5261c6b4c3392cdd27ecb5188b5d9ef350b35dc68

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