Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb25b2acaa8a9e4c…

MALICIOUS

PDF

83.2 KB Created: 2021-04-01 06:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 938e0e58cbbcbb1bef5217c68c59a1f0 SHA-1: 490b8d72916023feb04b7e1780b4c8fd63aba725 SHA-256: cb25b2acaa8a9e4c8b2e61b1b2476fd0c61d85fb860db1240a3cdc25e4975868
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various PDF documents, potentially serving as lures or further stages of a campaign. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of malicious intent.

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://leonvi.ru/wix?keyword=1v1+games+unblocked+fortnite
    • https://cdn-cms.f-static.net/uploads/4472488/normal_605db18ce74ab.pdf
    • http://espaceabonne.com/focus_on_grammar_4_4th_editionvhcgs.pdf
    • https://cdn-cms.f-static.net/uploads/4445130/normal_601806a5f3ffb.pdf
    • https://cdn-cms.f-static.net/uploads/4365580/normal_6021d05406cee.pdf
    • https://cdn.sqhk.co/vujagefamig/qifI7MN/money_saving_achieve_goal_chart_printable.pdf
    • http://podcard2020.site/mopusagilegabam87g7.pdf
    • https://cdn-cms.f-static.net/uploads/4413454/normal_60307eb98b894.pdf
    • https://cdn-cms.f-static.net/uploads/4492259/normal_601233f44a0ab.pdf
    • https://cdn-cms.f-static.net/uploads/4493545/normal_60400450b2710.pdf
    • https://cdn-cms.f-static.net/uploads/4501364/normal_600abd5865ff5.pdf
    • https://cdn.sqhk.co/pakebisas/V7hdOWQ/beruwano.pdf
    • https://cdn.sqhk.co/bulunazi/i9Ljjgi/74163290901.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_ba03289ed45046fdb71d33f64a82af5c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7fc02e2f-06d5-4b5c-ac8d-593bd5c812bb/scott_pilgrim_comic_color.pdf
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_94e03ba015334f9cb00baee90f754e5b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a25a33b-0ffe-441a-9c04-d80a02aab3fd/mulurotofodumitokala.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96c.bin
16285895fb29e0b8524bcabd6a57fe54275a2f72a90ef8350571066e9a93d934		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 5444 bytes
font_01_sfnt_off00010be2.bin
7fc8b1a5ed9c634e1d41f033aa741c949b4ff1b296d0c1e42d46e001152fce26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 11184 bytes
font_02_sfnt_off0001321b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1321B 4324 bytes

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