Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fb87675f1840e2…

MALICIOUS

PDF

69.7 KB Created: 2021-10-04 00:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ec6805cd56a733fda4a1f80ca433878d SHA-1: 0c5ed1179211efdec36c9b7f2c8487974d650068 SHA-256: b4fb87675f1840e29dea2296778d3238224377dcfd9d4a1248aa11b0c57f4131
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs are embedded, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=guns+and+roses+vocalist PDF link annotation
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/58c465b76e5fe2b4c9b9580a84f1cab5/16954573501.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/temovarujifuvidebafusuba.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/50654480066.pdfIn PDF document text
    • http://cosyromania.com/media/file/padivuwagewufi.pdfIn PDF document text
    • http://unityproductions.com/upload/files/tiwutido.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/tufozoxowi.pdfIn PDF document text
    • https://mcsfood.com/images/file/60556532140.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/fifupime.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/lizuwowepabimisowurogup.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/dogisug.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091307015380554.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1615292ec04ac6---pomupuxavubudajaga.pdfIn PDF document text
    • http://nyt.jp/p_images/resource_library/file/7981306937.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/72955001990.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/nugopawoxagutifibum.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/79694461794.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/94623433061.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/fisuwogok.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/xatef.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/pinibixodik.pdfIn PDF document text
    • http://allycatering.com/userfiles/89292600319.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/leguf.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xasoxobawalopowese.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/40395053844.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_off0000afc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 10568 bytes
SHA-256: 2461ae58668b3402bb648e3124191497ec8fd0aae011a993a0685df3741008d3
font_02_sfnt_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 16028 bytes
SHA-256: 71c757e26cea185130eea4ef56d7e26edc216bed0e1cbad4aceb53fba7b02192

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