Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e413215cd58538…

MALICIOUS

PDF

79.9 KB Created: 2021-04-27 10:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b4241be9634f5df62e6ee794f2efaaf3 SHA-1: a91e119522e267d59a8e38652a3d89c89009159d SHA-256: e4e413215cd585380c5e5e632efcd1e20f61751b0a4cdc5bf3a9b5c671b7af43
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URLs pointing to suspicious domains, specifically 'kuzutuzo.ru' and 'llloooodddd.space', which are likely used to host phishing content or distribute further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=jack+and+the+beanstalk+story+for+preschoolers PDF link annotation
    • http://llloooodddd.space/cerere_demisie_cu_preaviz_2019qy4wg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_604d903a98692.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/pokemon_mega_emerald_x_and_y_editionk4roj.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/f0Oxejb/prank_sound_effect.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417528/normal_600355fd970c2.pdfIn PDF document text
    • http://fallofelin.online/xojesoxaselazisucw10j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409238/normal_5ff3c9eee4654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450511/normal_6005dbed7feea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_6038243291e05.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/theory_of_justice_brief_summary_sparknoteswcez0.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/gy3hb0v/family_board_games_all_in_one_offline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_606025abcd6e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_6010576c90ca8.pdfIn PDF document text
    • http://fruitnaturs.space/keduzuwuwoxakyf56u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixodog.rf.gd/32760041795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0496e1b6-5b20-42ce-8b57-d232ba0904fa/practicing_the_presence_of_god_brother_lawrence_audio.pdfIn PDF document text
    • http://rexerutagid.epizy.com/vemilugebivajisideduzub.pdfIn PDF document text
    • http://wotekobadukabuz.rf.gd/70037392542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec6edab-ac96-41f7-a31f-48cebb967d45/words_to_song_ive_got_peace_like_a_river.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 5540 bytes
SHA-256: d89f98241a495ffb1c7b16922f9ea92c4c3ebff86ae4501f8a3ff973b012cb00
font_01_sfnt_off00010e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E38 10484 bytes
SHA-256: 9f176ec9c64c12dbbb11b9175f80de2c5438ee3d6ccf6517b9763faa64846dac

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