Malicious PDF — malware analysis report

Static analysis result for SHA-256 67395e06d2b80503…

MALICIOUS

PDF

81.5 KB Created: 2021-04-23 09:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2468a22adb5dcf70a579aa017aafb64e SHA-1: 43b3b3a4c9ecfb6d5411b513e2da41a2ee186748 SHA-256: 67395e06d2b805039552dca2c95fb5d05299fdcedaf5dccda185317e8b1d2a39
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm. No scripts were extracted, but the PDF structure itself suggests an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://gimoguvi.ru/strik?utm_term=how+to+study+for+ca+real+estate+broker+exam
    • http://nosumiva.mywebcommunity.org/revista_dibujarte_descargar.pdf
    • http://pogawubujogeje.mypressonline.com/english_idioms_in_use_intermediate_book_with_answers_vocabulary_reference_and_practice.pdf
    • https://cdn.sqhk.co/sileluzorupo/gcgehgB/infinity_symbol_latex_small.pdf
    • http://wumiwuzigimo.mywebcommunity.org/99676065225.pdf
    • https://cdn.sqhk.co/rufopunuk/cpiah0x/heroes_charge_tech_contest_difficulty_12.pdf
    • https://cdn.sqhk.co/jobiwokojo/0vjhP6z/shooter_arena_mod_apk_unlimited_money_and_gems.pdf
    • http://kejurudoji.medianewsonline.com/88375535466.pdf
    • http://gezakiribonenin.mywebcommunity.org/vufapelukuvesikidilor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_5edc1ffa48414d158c2b50c63ad406cc.pdf?index=true
    • https://s3.amazonaws.com/zedudo/comtrend_default_password_ar-5381u.pdf
    • https://s3.amazonaws.com/wudibirewuduto/mukajuninawovejomuna.pdf
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_77768e1ab7ed4a4da375fc82bdb820d1.pdf?index=true
    • https://s3.amazonaws.com/jirebonudur/newafo.pdf
    • https://uploads.strikinglycdn.com/files/5a558f75-663e-456d-9d15-a523e84d8e7c/what_are_the_traits_of_a_manager.pdf
    • https://f43304fd-85e4-489a-8612-81977e01be4a.filesusr.com/ugd/b6f504_f1dc065bd37347b6969298a6911709a2.pdf?index=true
    • https://s3.amazonaws.com/dorulusof/logarithm_rule_worksheet.pdf
    • https://s3.amazonaws.com/lopeteb/2003_jeep_liberty_lifted_for_sale.pdf
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_7375cf3835684f23b6ccb657bb78596e.pdf?index=true
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_f5c2399fbaa144ddbe9206370d7f8f42.pdf?index=true
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_c326393e397b4c5ca34d6ac5f3a8af00.pdf?index=true
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_c9e423a3482441d48507944896462ca0.pdf?index=true
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_09ad2bdd8ad044b19f6051784d924c10.pdf?index=true
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_f71d3e8eafce4635acb013fbfde2a5e7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f10c72ca-13d8-4a94-be4b-81e2d2db6648/doxilonigetano.pdf
    • https://uploads.strikinglycdn.com/files/1c3faef3-14fd-45b0-a0fe-88d5008f0c6c/bryant_furnace_model_915sa42060s17.pdf
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_aae30566ab6f4071ae547d5af9c85b0c.pdf?index=true
    • 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_off0000fcd6.bin
9072eecf13b8f1e1f7d1c1e851e0a91d9980e46c9a3e4940fcde8513dc2cc479		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 5592 bytes
font_01_sfnt_off00010fdf.bin
4000d2f81d1405a314f8df9779fcbc69b873d8c85eec30d4e19966fa561a9ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 11144 bytes

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