Malicious PDF — malware analysis report

Static analysis result for SHA-256 949df06fdfb65fcb…

MALICIOUS

PDF

77.6 KB Created: 2021-04-26 00:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5489b15c2403611eabee9c2f2e252f0b SHA-1: 236ed052c8c88cd5d11a1e3f54c8b07267e97f5d SHA-256: 949df06fdfb65fcb92d7ac7f12c8da77253255ecdcf69387627eafde40838333
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, a technique often used for SEO poisoning or to direct users to malicious sites. One of the primary URLs identified is https://kuzutuzo.ru/strik?utm_term=madame+bovary+cast, which likely serves as a landing page for malicious content. No scripts were extracted, but the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/strik?utm_term=madame+bovary+cast
    • https://cdn-cms.f-static.net/uploads/4378164/normal_605c616570a69.pdf
    • https://cdn-cms.f-static.net/uploads/4412396/normal_601553acc9fb3.pdf
    • https://cdn-cms.f-static.net/uploads/4446650/normal_603d31832eebb.pdf
    • https://cdn.sqhk.co/lamidipeke/d0ggBEa/no_limits_race_to_sunderland.pdf
    • https://cdn.sqhk.co/zafupusapun/hhhghhf/roblox_promo_codes_generator_2019.pdf
    • https://cdn.sqhk.co/wibetaxor/hHKjhie/sukepi.pdf
    • https://cdn-cms.f-static.net/uploads/4366044/normal_60514706d1239.pdf
    • https://cdn-cms.f-static.net/uploads/4370996/normal_6045c3164921c.pdf
    • https://cdn-cms.f-static.net/uploads/4388060/normal_5fe6a4c1def03.pdf
    • https://cdn.sqhk.co/rujoremebi/giAgdgh/66480701835.pdf
    • https://cdn-cms.f-static.net/uploads/4384159/normal_60255c3402e4d.pdf
    • https://cdn-cms.f-static.net/uploads/4446038/normal_604a873a5c491.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jimugivos/53389591251.pdf
    • https://s3.amazonaws.com/borokegujuzero/cheats_world_war_z_ps4.pdf
    • https://b2691e05-be35-46d2-a26d-08c503de0475.filesusr.com/ugd/b15c0b_278ca5d77ac440caa7e44dd12210244e.pdf?index=true
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_5bec5000b59b4119a6ba80b18f746e24.pdf?index=true
    • https://s3.amazonaws.com/gagagakigibapo/zijoj.pdf
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_5de71493e28641c7824f138e5622eb61.pdf?index=true
    • https://s3.amazonaws.com/goneduzum/15344260074.pdf
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_9de90e9c0d7d4b18b6ce6ed0af15b0c8.pdf?index=true
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_fc210cc43dec47f488ac7ca10c9e75b4.pdf?index=true
    • https://s3.amazonaws.com/safenalavojuwu/pac_man_game_free_for_mobile.pdf
    • https://s3.amazonaws.com/vipinib/can_priests_use_staffs_in_wow_classic.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_off0000f055.bin
271db16d3730e7babb59ea9d95e419774c39b8e99f4d95189a4c675bce998cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 5360 bytes
font_01_sfnt_off0001028b.bin
0593b4e1df64d35a57fa6481892442ca209ffa69209795fd7d48b995eb53e130		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 11340 bytes

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