Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f82a108226cb9a5…

MALICIOUS

PDF

91.4 KB Created: 2021-05-11 19:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dea3157da8597f1d76eeeb0f97a4e399 SHA-1: b6cb6370d71d2c0ee73bb7e75deaa9103e046bbb SHA-256: 3f82a108226cb9a58c472dfe2f2a1e93657baa91a2557fd0bf25c6a97b5c8a57
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to a 'teaching guide', suggesting an attempt to trick users into visiting malicious sites for further compromise. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=the+book+thief+teaching+guide
    • http://feldhaus-klinker-plitka.ru/hp_deskjet_3050_driver_mac_catalinashlfh.pdf
    • http://vuvulusigi.scienceontheweb.net/pathoma_2019_reddit.pdf
    • http://floradoma.net/dr_babasaheb_ambedkar_jayanti_photolwrcv.pdf
    • http://vumexovuvelafe.medianewsonline.com/29315750147.pdf
    • http://mikazuxo.mypressonline.com/commodore_64_emulator_windows_xp.pdf
    • http://polfact.site/58712900706by0v1.pdf
    • http://wozupabalaviv.medianewsonline.com/kenmore_washing_machine_parts_canada.pdf
    • http://finipupote.mywebcommunity.org/jutuvakuz.pdf
    • http://bipowilago.mywebcommunity.org/13965429288.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fijorolur.myartsonline.com/zevokizadoripop.pdf
    • https://uploads.strikinglycdn.com/files/8e3ab371-0fec-4c46-a675-a32af680b54b/hyundai_dealership_maintenance_near_me.pdf
    • https://uploads.strikinglycdn.com/files/76af5153-1f2d-4e18-892d-27d16bf8bb02/70732822505.pdf
    • http://nakogis.myartsonline.com/kurivifisofusewi.pdf
    • http://lijowavatajo.myartsonline.com/bachelard_poetics_of_space.pdf
    • http://semowomeso.onlinewebshop.net/43658153279.pdf
    • http://logiweliziweje.onlinewebshop.net/25862695746.pdf
    • http://netomadutimafe.onlinewebshop.net/rofosuvokerezili.pdf
    • https://uploads.strikinglycdn.com/files/3063e7ef-d777-429d-baed-7ac78e27ac5c/after_novel_anna_todd_summary.pdf
    • https://uploads.strikinglycdn.com/files/bab55c93-11ac-47f8-9842-406236c3eeaa/how_to_cross_the_river_styx.pdf
    • http://furunes.onlinewebshop.net/veloxiwewojujum.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_off00012a5d.bin
1a263073b94a9015a2b1f2e32ea3e848f6f4d424cd667ac7e788e9ac1eb9cb59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5D 5132 bytes
font_01_sfnt_off00013bd5.bin
2ac9a0fa67da5afdbc3eb7670fa55ba628700986d1d02357bd90ea1c97d52576		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 10620 bytes

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