Malicious PDF — malware analysis report

Static analysis result for SHA-256 8192da1c7d82792c…

MALICIOUS

PDF

95.6 KB Created: 2021-05-25 05:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 042f877e7bbf067961d6c2ff21a76692 SHA-1: 91a5598d7b35925365c0600ce87b41e12d80ae14 SHA-256: 8192da1c7d82792c47e48a278b71fb81dabd6e01fe1b6757bf72cb422a5a9d61
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or a distribution mechanism for further malicious content. The primary URL identified, https://jacksth.ru/strik, is likely part of a phishing or malware distribution chain.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=imagitarium+auto+feeder+instructions
    • https://static.s123-cdn-static.com/uploads/4453907/normal_6000f994be378.pdf
    • https://cdn-cms.f-static.net/uploads/4459654/normal_60593ce0f2655.pdf
    • https://cdn-cms.f-static.net/uploads/4388421/normal_603a91eac73b5.pdf
    • https://cdn-cms.f-static.net/uploads/4369927/normal_6047602c8f8d8.pdf
    • https://static.s123-cdn-static.com/uploads/4379363/normal_5ff7eeee68792.pdf
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5fe9088b3f6ac.pdf
    • https://static.s123-cdn-static.com/uploads/4489259/normal_5fecd1f030776.pdf
    • https://dujejasafat.weebly.com/uploads/1/3/0/7/130739214/6608786.pdf
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/d2430a9ae2.pdf
    • https://kakabotosor.weebly.com/uploads/1/3/0/7/130775724/navovixuzemi-votikuno-merajipaselip.pdf
    • https://cdn-cms.f-static.net/uploads/4455370/normal_602f9a3f0b9b4.pdf
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/zapevugobez.pdf
    • https://static.s123-cdn-static.com/uploads/4420776/normal_600737891e4a3.pdf
    • https://cdn-cms.f-static.net/uploads/4386080/normal_6019bd98e8f8a.pdf
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/4109416.pdf
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/kimazidamufixibe.pdf
    • https://bibuzutevokad.weebly.com/uploads/1/3/4/6/134634257/248404.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rabewiruzitewa/73779254473.pdf
    • https://s3.amazonaws.com/bokexizometun/95153531143.pdf
    • https://s3.amazonaws.com/tuzakifezara/diwur.pdf
    • https://s3.amazonaws.com/kefiperizonofu/red_storm_rising_game_download.pdf
    • https://uploads.strikinglycdn.com/files/0ef6fb82-e648-42f4-ae79-d600ac7b121a/how_to_study_engineering_drawing.pdf
    • https://s3.amazonaws.com/tubukeganuji/borbaad_movie_video_songs_pagalworld.pdf
    • https://uploads.strikinglycdn.com/files/cf4d788b-8c69-437d-a475-1096992b9b5f/signs_and_symbols_nabokov_quotes.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_off000138d2.bin
06cc4d1b9a7c72b61c776ba4cb7afd5362c37dd5249e5497cbfc9262e6b07d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138D2 5248 bytes
font_01_sfnt_off00014a94.bin
20f645993f5b8980a74129818a4dc17208097ed7900b2a3a41b1f47e003d673c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A94 10996 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.