Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8cce7f2472cadc…

MALICIOUS

PDF

76.3 KB Created: 2021-05-12 19:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4f594c62dd31efb24f974404499bb780 SHA-1: 1a0f4e9babfa23c641d9840db453bbdd1e895b3e SHA-256: ae8cce7f2472cadc8ba0a99fa9761374fdbb97deb0b257396daafb197dadc539
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one, 'https://jottigo.ru/strik?utm_term=how+much+does+a+theoretical+physicist+earn+uk', appearing to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to physicist salaries, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=how+much+does+a+theoretical+physicist+earn+uk PDF link annotation
    • https://cdn.sqhk.co/ragejeli/0Pqjeii/pibosegepasifenekete.pdfIn PDF document text
    • https://cdn.sqhk.co/mejapevelu/fgenBne/50353191015.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/xuxulojelifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443578/normal_5ffc667490109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488141/normal_5fc95ca13bc6e.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/gizakevopiwurogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_601237d57e0cd.pdfIn PDF document text
    • http://lezofifividex.scienceontheweb.net/74908518239.pdfIn PDF document text
    • http://vizemezezu.sportsontheweb.net/64616351210.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/dgcEOhi/jimosukelururu.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/xawagogi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486060/normal_5ffd0aa39b4e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc24e5de-5601-41c4-a9e5-882eb63407dc/mosquito_magnet_patriot_plus_troubleshooting.pdfIn PDF document text
    • http://visunes.myartsonline.com/92728152666.pdfIn PDF document text
    • http://zerowegujij.onlinewebshop.net/best_reader_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3ff664-8e3c-4bee-af15-05d3d0e66741/how_to_read_thoth_tarot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ce8417-519d-4ba8-b839-1db39cbdf2be/borapodezezabugudu.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/proyecto_arquitectonico_de_centro_cultural.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce2263a-1d7f-4b8c-abab-7c08996e110a/big_little_lies_season_3_episode_7_recap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/594eac05-f7fc-4bd1-8d43-e4f8056c2a40/25845002676.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/bodybuilding_cutting_plan.pdfIn PDF document text
    • http://defakulid.atwebpages.com/slavery_in_the_united_states.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/darth_maul_lightsaber_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/how_to_tell_if_your_dwarf_rabbit_is_happy.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_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 5532 bytes
SHA-256: bf0ddecc5713092c15858f072565c45cf32873d38a5541e169cc252a0b7fde45
font_01_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 10544 bytes
SHA-256: b807fb3e6b1f827eb97ed7d38a415098cd539a9e82dc5ec199c6690725ab27ff