Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9c3217d4cf02e3…

MALICIOUS

PDF

81.0 KB Created: 2021-04-04 13:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17df699a80254255c85de87671ad7a11 SHA-1: d1264d036e3e2151aebfa16efcba12753ca1f32a SHA-256: 2f9c3217d4cf02e3655744fb0c9ff0e46fc2b671c341502bb58b9e24d783ca48
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 book downloads, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

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://vilenefex.ru/award?keyword=c+programming+book+pdf+for+beginners
    • https://cdn-cms.f-static.net/uploads/4365656/normal_6045e70751009.pdf
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd6368935d96.pdf
    • https://cdn.sqhk.co/butixasa/gfdjje9/best_ya_paranormal_romance_books_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fe9279679c11.pdf
    • https://cdn.sqhk.co/menodotitit/fjcqzhD/45775747516.pdf
    • http://fionainthefield.org/the_death_cure_trailer_release_datejzl1g.pdf
    • https://cdn-cms.f-static.net/uploads/4449605/normal_60623b2774d74.pdf
    • https://cdn-cms.f-static.net/uploads/4485702/normal_60490319f0746.pdf
    • https://cdn.sqhk.co/dezorevukor/fgiiijj/vusipusisatonedujo.pdf
    • http://ionatr.space/facebook_cover_image_size_templatebx6hu.pdf
    • https://cdn-cms.f-static.net/uploads/4402262/normal_604664899e54d.pdf
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/siposigudedev_felud_vogisog_safavovanodope.pdf
    • https://static.s123-cdn-static.com/uploads/4421781/normal_5feec2c310fc7.pdf
    • http://chambrehub.xyz/lonusozurudowirivejazosej7brey.pdf
    • https://vugevosuza.weebly.com/uploads/1/3/5/3/135328642/vabotopafodopo_nagefabi_muxumisuxusex_sosaf.pdf
    • https://cdn.sqhk.co/bebumila/hc4jdS6/45180775909.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/85004e83-0f56-4d19-9c16-3f2b31675560/74893618734.pdf
    • https://uploads.strikinglycdn.com/files/217a84c2-9861-49c7-befc-8fbbab08bcb7/tabozorewugeginuw.pdf
    • https://uploads.strikinglycdn.com/files/0c555d8d-cd22-49f8-a88e-394178a0ebf4/why_wont_my_ipad_mini_touch_screen_work.pdf
    • https://uploads.strikinglycdn.com/files/aa17a86a-2ff2-4cc4-bef3-1b361b041558/diono_car_seat_instructions_video.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_off0000fe59.bin
b4379de24e697186f5042cb48650832e6d980ce075040cde698e2ad75ae1345d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 5436 bytes
font_01_sfnt_off000110bd.bin
ea24fe00e7722dc4878c7ed2b28c21d25442ba9e769414d431b3d3420751bb2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 11164 bytes

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