Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec0fadd60eb17da…

MALICIOUS

PDF

72.7 KB Created: 2021-03-10 08:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81f9b8ea758687d01a343f19093384d7 SHA-1: e0cc4f385e5a56ca6ac250200620212d0be47591 SHA-256: fec0fadd60eb17daa13d7685a6ed0c1df1768dadb7d8e4cf99eee9ac49f11be7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing malware or phishing content. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to trick users into downloading further malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=aitt+apprentice+exam+paper+pdf+download
    • https://cdn-cms.f-static.net/uploads/4422145/normal_6042fb6a3d5fc.pdf
    • https://cdn-cms.f-static.net/uploads/4365599/normal_602ca9a8d19ff.pdf
    • https://static.s123-cdn-static.com/uploads/4368758/normal_5ffb055a46ca9.pdf
    • https://static.s123-cdn-static.com/uploads/4452863/normal_5fccb57410db9.pdf
    • https://static.s123-cdn-static.com/uploads/4454432/normal_5fc7e818d7f20.pdf
    • http://kupiokno.su/harry_potter_storyteller_ornaments_2020hdqjr.pdf
    • https://cdn-cms.f-static.net/uploads/4380887/normal_6011e26442acf.pdf
    • https://static.s123-cdn-static.com/uploads/4424630/normal_5fcf0b8f4d5ca.pdf
    • https://static.s123-cdn-static.com/uploads/4485015/normal_5fec16c591de9.pdf
    • https://static.s123-cdn-static.com/uploads/4413850/normal_6000e4f3c3b45.pdf
    • https://static.s123-cdn-static.com/uploads/4477637/normal_5ff663e0b6547.pdf
    • http://shoop-fm.ru/reckless_rider_3d_hoverboard_smart_self-_balancing_wheel5up7l.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vukefuxi.epizy.com/how_late_can_i_apply_for_maternity_allowance.pdf
    • https://uploads.strikinglycdn.com/files/4a6d8579-c6e9-48c3-aa4e-1bf9d85b55f6/xevafavapuduroti.pdf
    • http://raxusitusumulag.rf.gd/apk_chess_rush_mod.pdf
    • https://uploads.strikinglycdn.com/files/e6565e07-af00-4f9d-ad46-de323b7d9bf4/do_grills_go_on_sale_for_black_friday.pdf
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_1c877a26a76c494a80f15823bce19c03.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c97581b-dcd0-44a7-8d06-e0cea7b94377/29895242636.pdf
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_c23b241decae4b36a025100ad5058131.pdf?index=true
    • 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_off0000dfc7.bin
45556de1f1f84a56e0ef1bc97dbec610ffe7b74dd1d0c5804a0190726474266c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 5272 bytes
font_01_sfnt_off0000f1b9.bin
fdc5cd7ac1a8fe45b0e702edb22b5db836fac4626f5bfa9d956d789b049c2310		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 10380 bytes

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