Malicious PDF — malware analysis report

Static analysis result for SHA-256 878a151cb8f4ddbe…

MALICIOUS

PDF

76.4 KB Created: 2021-05-26 13:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 577167926d0710c70d42d42fa30b6954 SHA-1: b44cbf843e804b1a345487a8de0667b13130ec5c SHA-256: 878a151cb8f4ddbe4bfdd3ec816c6920aed6ed5294a30f5a1d9deee0a857e964
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm containing numerous external links. The ML classifier also assigned a high probability of maliciousness. The embedded URLs suggest a phishing or SEO manipulation campaign, likely intended to redirect users to malicious sites. No scripts were extracted, but the presence of many external links indicates a high likelihood of further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=uci+2020+decision+date
    • https://wixuzezokanozav.weebly.com/uploads/1/3/4/6/134663812/jiwufonu_suwumodumurete_ximawevizozaku.pdf
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/wumab.pdf
    • https://static.s123-cdn-static.com/uploads/4426413/normal_5ffe67fdc0ba1.pdf
    • https://bawilawuvibowe.weebly.com/uploads/1/3/4/4/134401702/670692.pdf
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/5611992.pdf
    • https://cdn-cms.f-static.net/uploads/4469640/normal_606e6e94a453b.pdf
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/rakebuk-rumoduzeg-nutevalir.pdf
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5fe5ecbcb0d65.pdf
    • https://cdn-cms.f-static.net/uploads/4485935/normal_6023fb1209f19.pdf
    • https://cdn-cms.f-static.net/uploads/4376612/normal_605f9d7c714d0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b3300543-3133-4222-9fda-19a3bea9a25a/citation_petit_prince_rose_epine.pdf
    • https://s3.amazonaws.com/wazagidonux/jeminemobomosijelajugal.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/abordagens_de_ensino.pdf
    • https://uploads.strikinglycdn.com/files/52863e60-3890-43f9-baf4-80486865fb84/gadegedutenevuko.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/bose_901_series_6_review.pdf
    • https://s3.amazonaws.com/vuxagixil/black_and_decker_single_serve_coffee_maker_walmart.pdf
    • https://uploads.strikinglycdn.com/files/27ecabb9-4385-477a-82cf-004838998311/what_is_my_wand_pottermore_quiz.pdf
    • https://uploads.strikinglycdn.com/files/cad1ebe1-2f3e-47f2-85a2-83ed53e29bcf/roburusesilawazezofot.pdf
    • https://s3.amazonaws.com/jadere/53993424131.pdf
    • https://s3.amazonaws.com/fojaxexino/adobe_photoshop_free_full_old_version.pdf
    • https://s3.amazonaws.com/libeganot/how_to_reset_ipod_nano_4th_generation_to_factory_settings_without_itunes.pdf
    • https://uploads.strikinglycdn.com/files/f05aaced-8927-43ae-bd86-6d469edab208/uppababy_vista_2012_rumble_seat_weight_limit.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_off0000ec95.bin
4959195187c91db60deed80a95a586da8b45122cce8c8debb068daa46812a316
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 5072 bytes
font_01_sfnt_off0000fdeb.bin
c8797506fdbfb5d004a5912c331f17e47bdcaa256546f48b9f1937daa5c57bdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 11336 bytes