Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87e446e468b031a…

MALICIOUS

PDF

68.7 KB Created: 2021-03-23 14:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0a79554e15bc812a4fa32816255a899 SHA-1: dcbd2f9142ef7a41fc2c58865afccb19f50df9fa SHA-256: a87e446e468b031aaa08ed31eb258ff1251f27e6aa7789a921e12306e6881f98
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URLs points to a domain associated with a link farm, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host or redirect to other malicious content.

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-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://seumenha.ru/award?keyword=andromaque+texte+complet+pdf
    • https://cdn.sqhk.co/silinetufid/ghfb1jg/13723547808.pdf
    • https://cdn.sqhk.co/nanijamu/2jahbt9/63783365196.pdf
    • https://vibemabejux.weebly.com/uploads/1/3/4/6/134668328/najonaxema.pdf
    • https://cdn.sqhk.co/tuxonewebuke/hghhibe/kuvajif.pdf
    • https://cdn.sqhk.co/vilubofi/je2t8y9/pudetemepeku.pdf
    • https://cdn.sqhk.co/sewadokoka/AxXmhdX/63352146093.pdf
    • https://cdn.sqhk.co/mibaforetu/jd8VDV6/game_robo_avenger_mod_apk.pdf
    • https://cdn.sqhk.co/mekurapiw/jhhdDia/gigixebokosukazitisewuxe.pdf
    • https://cdn.sqhk.co/kajutizikodu/CnigxyT/11656324493.pdf
    • https://cdn.sqhk.co/gesokusa/hgdpUia/12974650506.pdf
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/kipawoxagezuxad.pdf
    • https://cdn.sqhk.co/pifixijowoka/cFicjbe/75285345100.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/legenapi/6172025856.pdf
    • https://s3.amazonaws.com/woberiz/african_tribal_mask_template.pdf
    • https://s3.amazonaws.com/fopalew/zanupot.pdf
    • https://s3.amazonaws.com/likadojivivofu/edius_6_full_crack_gratis.pdf
    • https://s3.amazonaws.com/midaguvimabof/costco_flannel_sheets_made_in_portugal.pdf
    • https://s3.amazonaws.com/faluzotixupi/bypass_wifi_captive_portal_android.pdf
    • https://s3.amazonaws.com/seriposuj/2012_can_am_outlander_800_service_manual.pdf
    • https://s3.amazonaws.com/jagux/pokonapena.pdf
    • https://s3.amazonaws.com/bogeguva/guxiwevetodupegoni.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_off0000cca3.bin
cb6ff310fbbbdc61d5d8a49c5ded1abe891c5fabaa0ffbbf0670d8ff100ab812		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 5308 bytes
font_01_sfnt_off0000de9a.bin
f91a1fa910754dffb5fe5c8a20a617133205ff8ce5e7827597142d1b2b2db18a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 11424 bytes

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