Malicious PDF — malware analysis report

Static analysis result for SHA-256 f302a307c05d6258…

MALICIOUS

PDF

79.3 KB Created: 2021-05-24 00:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd185be849c40abdede8281980e707fd SHA-1: 9cdb212dce58c27cbebea28851869abef5f9804d SHA-256: f302a307c05d6258e56a71b91853eb82dc260f5610cebb47741dd13abcfe4806
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL points to a domain associated with phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=how+to+teach+speaking+english+to+adults+pdf
    • https://cdn-cms.f-static.net/uploads/4504839/normal_601e7b31ebe62.pdf
    • https://cdn-cms.f-static.net/uploads/4417535/normal_6011a7da0a621.pdf
    • https://jajufuwupu.weebly.com/uploads/1/3/1/1/131163717/kemimarekimaz-fuxesoru-nibonego.pdf
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/waxumijajo.pdf
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/35b93cfed.pdf
    • https://static.s123-cdn-static.com/uploads/4446759/normal_5ff347a28cf4e.pdf
    • https://cdn-cms.f-static.net/uploads/4408463/normal_602ad600701ba.pdf
    • https://xuwobonamufaguw.weebly.com/uploads/1/3/5/3/135315698/tuwisemiferaket.pdf
    • https://bokitixeloto.weebly.com/uploads/1/3/5/3/135344606/pasonigotuwiw.pdf
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5fdd5dd1b4353.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7a99c7ba-be3f-415d-ad32-b7184273f0bc/2018_roadtrek_simplicity_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/f346a115-cc98-4df1-aa73-1307105ace92/gabigupalikif.pdf
    • https://uploads.strikinglycdn.com/files/c832d974-0444-4cf8-bcc2-3f22cd307b05/jedebomuluwitodisibu.pdf
    • https://s3.amazonaws.com/pasawe/hunter_remote_control_ceiling_fan_light_not_working.pdf
    • https://uploads.strikinglycdn.com/files/dd807268-238b-47b9-a4e3-6e44c141c406/12630910405.pdf
    • https://s3.amazonaws.com/midipes/xerelunaja.pdf
    • https://s3.amazonaws.com/sorapobuk/what_books_do_you_read_in_law_school.pdf
    • https://uploads.strikinglycdn.com/files/424c7bb6-47b0-41e9-a18c-2ffba7625b67/enfermedades_que_afecta_el_sistema_endocrino.pdf
    • https://s3.amazonaws.com/zunaporam/gabeberudimevidijotopomi.pdf
    • https://s3.amazonaws.com/rovikibixu/go_math_grade_5_answers_volume_2.pdf
    • https://uploads.strikinglycdn.com/files/d352dcf0-70dd-4495-a325-9d74810ad74b/stamford_the_aleph_in_the_mirror.pdf
    • https://uploads.strikinglycdn.com/files/6b42db98-5d12-46a7-9357-1a09da119641/caverns_dungeon_floor_plans.pdf
    • https://uploads.strikinglycdn.com/files/5176b50b-bcb2-41e1-8744-7c51826ad2c3/rebajagujune.pdf
    • https://uploads.strikinglycdn.com/files/3650e6e3-cbf8-42c2-b6f2-4daee73f30b7/what_is_the_message_of_poem_fire_and_ice.pdf
    • http://unr.edu/homepage/hayriyekkayih[at]unr.nevada.eduUniver
    • 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_off0000f81e.bin
90ae6bb282aa78cab6bde421e7bd054ee04646a758fc221f0262f33670495334		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 5436 bytes
font_01_sfnt_off00010ab4.bin
317df5f2123faf3ee30212a646d2d323296f671e69aa571817bc39201588d96e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 10776 bytes

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