Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe38d2191711e1d…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 07:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c59cf7e8e2b4c277909ec71e8c1acf9f SHA-1: 262b369ba13d373f6c9d9f2f7655f371a0fd21f2 SHA-256: bbe38d2191711e1db5c109611d7d5f713f8b14e5dc2f966855f30a9e1768d56e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://xezojetit.ru/123?utm_term=empyrion+galactic+survival+guide
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/661865.pdf
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/1296298.pdf
    • http://biomanuawebsiteua.xyz/insanity_flyff_blue_chips_guidew10w6.pdf
    • http://goproonly.com/agm_battery_tender_harbor_freighthhtqi.pdf
    • http://digitalmicroteter.xyz/how_to_change_transparent_background_to_whitekfo4v.pdf
    • https://wilibuluso.weebly.com/uploads/1/3/6/0/136086636/5060712.pdf
    • http://lalashoppen.online/46421808706k5h1o.pdf
    • http://mizejodaf.mywebcommunity.org/porujomilewav.pdf
    • https://mirenixumevi.weebly.com/uploads/1/3/5/3/135309561/dafojakav_zunidav_tovojo.pdf
    • http://bestita.space/naselilizakunexanume0zm.pdf
    • http://rolorutebu.sportsontheweb.net/og_mandino_university_of_success.pdf
    • http://lordtrans.ru/setadivedatanozipevrmib.pdf
    • https://toxupenowa.weebly.com/uploads/1/3/4/0/134042648/ramakixodi.pdf
    • http://mazafaka69pussy.online/236336041749zefl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_9b6c9fda9c77418daf6fd01d88b37239.pdf?index=true
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_69d3a96184e845ca8ab85b6e21bdc6f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/14824b2d-0469-4e2a-8e56-2481d62aba47/how_much_does_infinix_note_7_cost.pdf
    • https://uploads.strikinglycdn.com/files/bcdb5297-374c-49b3-8306-ae5faa847100/how_hard_is_ap_physics_c_electricity_and_magnetism.pdf
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_bc9f4bbf99b84102bb7cc6466fe0e1e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b69fe1dc-669e-444f-90d4-b211763951cb/cosco_scenera_next_front_facing.pdf
    • https://uploads.strikinglycdn.com/files/0fc15ce7-2338-4359-adae-4680e8966e63/36_trn_c_tho__nng.pdf
    • http://xuxerutiwuv.onlinewebshop.net/vejawove.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://empyrion.gamepedia.com/Setting_up_Dedicated_Server_(Guide
    • 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_off0000e656.bin
f7ed3615fabd196a57854063127ade5423b8b0bed1d963c9e128d35e525a2a53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 5512 bytes
font_01_sfnt_off0000f90c.bin
f42580c13e6450ab0243de54d03c41a8a7e767b3fdb1e0898ddf20d61ffaa075		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 13104 bytes

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