Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59c65ca557b2b11…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 13:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29f4244ca9dd8bfb55f824bcd01c6ee2 SHA-1: b0ce6df292ee37b70d24b72ca122632bae942ffb SHA-256: a59c65ca557b2b11bf3df9030d2dc6a85e0286d04cb939032306db6b846e5291
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the PDF is designed to artificially inflate search engine rankings or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=ludo+world+play+online+free PDF link annotation
    • https://dom4m.de/userfiles/files/99314783315.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/fibemagefaforapikus.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/gutevojuji.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/98134731470.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/68226388145.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/vufalifagatos.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/91598823657.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/29529265974.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/nikimepasolunerus.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/25368902157.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/97701650623.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/lemosazalevugit.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/murudavubitujibetiziziro.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77560600405.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143569c71484---kufelonodipivizunuratajow.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fadoboluzogutore.pdfIn PDF document text
    • http://labradory.pl/file/xujedewewew.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210913040255_s4llm3.pdfIn PDF document text
    • https://inks.bg/userfiles/file/12797976446.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/59054882677.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/94114244436.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/momatorapunuguxojovokavuv.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/pumixexutipegefuvowefe.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/jaragefejijijo.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://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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 10484 bytes
SHA-256: 52a36931b038f95e7ed04abec3473aa551bb36f1790251bcf3af232f0530a831
font_02_sfnt_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 18048 bytes
SHA-256: 370a59ffee4fc71be33303f7b945264cb8551229bbadc203d0f68559eea01ae3

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