Malicious PDF — malware analysis report

Static analysis result for SHA-256 087b580a3c04981d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 03:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 219fcf649aac0951c2a457d7313e6f38 SHA-1: 6895b5dd9d82142eae094305d6c7073c7aa34cd4 SHA-256: 087b580a3c04981d56b6d3a7d62d3cf8e15cb3c483480813da46a894fa8b77d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=android+phone+with+less+bloatware
    • https://ntiverification.com/userfiles/file/42097469040.pdf
    • http://burmeseburmilla-allevamento.com/userfiles/files/65255875468.pdf
    • http://whuntex.info/userfiles/file/jizawujizijarozapelofovo.pdf
    • https://siangyun.com/upfiles/editor/files/90932949383.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/womelavewovikinubotu.pdf
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/xamevamapuzudogev.pdf
    • http://narnivet.com/userfiles/files/94679789959.pdf
    • http://cdenito.net/userfiles/file/vozivigufepekuzewunepiwe.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/19005996329.pdf
    • http://surveycook.com/upload/tmp/202109/file/fusedizixefa.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/73671216379.pdf
    • http://geo-equipe.it/userfiles/files/86864335004.pdf
    • http://bociany.sk/media/file/30219965398.pdf
    • https://weboonline.com/ckfinder/userfiles/files/gojije.pdf
    • http://tw-jia.com/uploads/files/202109120015029843.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfa47cb71---bugivoligoxono.pdf
    • https://dmshospital.com/mm_engg/files/80084224857.pdf
    • http://moyamoya.center/images/hand_uploaded/files/ginutejagujapizujibi.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/61579785637.pdf
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/86070583140.pdf
    • http://irvine.songhakbbq.com/uploads/files/duxemosulakabawuxajorijo.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed360e0886---vabonuvonu.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/52674888359.pdf
    • https://aluminiosarla.com/userfiles_arla/files/xagiwupen.pdf
    • https://hanyauntuktesting.com/contents/files/6131763183.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b12c.bin
6e6bd798939fec75f4204a9ebc117daaf6fad0da6afe78992fc3176bbfe70b75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB12C 16092 bytes
font_01_sfnt_off0000da44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 16792 bytes
font_02_sfnt_off0000f25b.bin
4bdc71f925535d382510f5e931e10b9b8c676c18bd9dc73519d6e0a68d0c7c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 10696 bytes

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