Malicious PDF — malware analysis report

Static analysis result for SHA-256 6106f8259dfd0012…

MALICIOUS

PDF

88.8 KB Created: 2021-03-12 03:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b0f8ef08bd04ed66f9571b25576734 SHA-1: 20ca46e0c26704093eb67146cad6d8b3a86f70bd SHA-256: 6106f8259dfd001298993bccfae8d8e04b072cf78f6e703afbe9c200e2ff274b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing campaigns. One prominent URL, 'https://zajinet.ru/award?keyword=definition+of+international+accounting+standards+pdf', suggests a lure related to accounting standards. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=definition+of+international+accounting+standards+pdf
    • https://cdn-cms.f-static.net/uploads/4444110/normal_6043eb2d30a6c.pdf
    • http://bomepufibawil.scienceontheweb.net/specialized_speedzone_1_cycling_computer_manual.pdf
    • https://tawozajoruje.weebly.com/uploads/1/3/4/3/134314125/xuveki.pdf
    • http://fikosarodone.medianewsonline.com/2d_3d_shapes_worksheets_grade_1.pdf
    • https://static.s123-cdn-static.com/uploads/4494431/normal_5fe277327b6e0.pdf
    • https://static.s123-cdn-static.com/uploads/4381762/normal_5ffc58ebd9a04.pdf
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5fcc8b08cec22.pdf
    • https://xegogebereduxu.weebly.com/uploads/1/3/1/1/131164392/seramomup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c4fc9afa-419f-4355-9575-4526bfbc5aed/fatubomema.pdf
    • https://uploads.strikinglycdn.com/files/9c3284c5-e42e-4a03-80f6-e5db67c64590/zedoribanedofigusosoxidu.pdf
    • https://uploads.strikinglycdn.com/files/d14eea64-a118-41a2-b4fd-60a581b7022a/hermosas_criaturas_pelicula_completa_en_espaol_latino_online_gratis.pdf
    • https://uploads.strikinglycdn.com/files/bf96e56c-7692-4f18-9d65-456d079470fe/53082784469.pdf
    • https://uploads.strikinglycdn.com/files/6ccaa3d3-575b-4dbc-8d40-d126d5b88e3b/jexemeza.pdf
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_6db976e2b774412dabd71ff19df3d48c.pdf?index=true
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_0f0b3e87fcde471390d045a5c94f7804.pdf?index=true
    • https://uploads.strikinglycdn.com/files/919ddf3a-018e-416e-b3d1-995b98a50bd7/pelupiwugosuxilu.pdf
    • https://uploads.strikinglycdn.com/files/a7058f5a-01ba-403e-a39a-34934d314b35/gardens_of_the_moon_review_reddit.pdf
    • https://uploads.strikinglycdn.com/files/c1f5796d-35d7-4e66-9389-a1183b30ed3b/91906468743.pdf
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_a197be9bf0ed4e2e8eba83d6244ff33e.pdf?index=true
    • http://wadoromutisagar.myartsonline.com/tupuwitixasatedevedu.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c4a.bin
e5da97eff910457da0e768027aa3a1de29c0ccd23ca1baa18dbe319cabd45a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 5320 bytes
font_01_sfnt_off00012e7b.bin
d593cdaafa4138aa8ca76b2585d0a9df27e88a9cd40b13fedff26315e093f6a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 11048 bytes

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