Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fedc63f05272733…

MALICIOUS

PDF

69.1 KB Created: 2021-02-19 21:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae23d99cbdb13b5dc03c27a780a64af7 SHA-1: d368c826a804e98e47236d713fc28ee7789fb40c SHA-256: 9fedc63f052727331cfc77ad7eb8a47943da103df470097c9b3e3e0e73df2a63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to various PDF files, potentially serving as lures or redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=instep+bike+trailer+parts+list
    • https://cdn-cms.f-static.net/uploads/4445889/normal_600b67fd61a21.pdf
    • https://cdn-cms.f-static.net/uploads/4470028/normal_602dfba616655.pdf
    • https://cdn.sqhk.co/dojarodawiw/vjiZtge/dizetitile.pdf
    • https://cdn.sqhk.co/vodadavubex/zgjjhjf/oldies_music_radio_station.pdf
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/9616272.pdf
    • https://static.s123-cdn-static.com/uploads/4444885/normal_5ff5c5c409c88.pdf
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/9779926.pdf
    • https://cdn.sqhk.co/feripamapuv/giijcYg/lyrical_video_maker_app_without_watermark.pdf
    • https://cdn-cms.f-static.net/uploads/4383794/normal_6022169f00fd2.pdf
    • https://tafanoxuxirugo.weebly.com/uploads/1/3/5/3/135327873/tozoduvuwubus_dezawokuzugazok_tavogemujelovip.pdf
    • https://gemigefe.weebly.com/uploads/1/3/4/6/134602098/6951406.pdf
    • https://cdn.sqhk.co/dubikureta/iiSid0x/57552826609.pdf
    • https://cdn.sqhk.co/pugalaleluti/XSahghc/barber_shop_near_me_walk_ins.pdf
    • https://cdn.sqhk.co/kewudomavave/jf3jcji/80768337353.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dinilederu/mupojaz.pdf
    • http://mirepili.epizy.com/21429813244.pdf
    • http://ximajuranoda.rf.gd/the_laws_of_spirit_world_free_download.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_off0000d2d6.bin
ff65992b3bdd218a5c1030f0f7b19feeb492a58ee37b6fdce422c6ad7c445e15
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 4952 bytes
font_01_sfnt_off0000e3ba.bin
dd6fe8632ce68f5d819244b0fe577d00ef2562522ed5ad7d4c30dc07e04f5330
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 10476 bytes