Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f222e5ae3cfc8c…

MALICIOUS

PDF

69.9 KB Created: 2021-03-29 14:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9686d51ef7b9cd6e85842ee86fb00833 SHA-1: 1c2ffbbdf6cb59079fdf1c1b93f358d701cc836c SHA-256: c3f222e5ae3cfc8cde040cae545f536c0768f9c4f9c7b398e84a9a29daa497c4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=fishman+loudbox+mini+user+guide
    • https://xipakopubax.weebly.com/uploads/1/3/5/9/135966228/6164486.pdf
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/e20409c.pdf
    • https://wapofaxuza.weebly.com/uploads/1/3/5/9/135992917/9161050.pdf
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/sudexowud.pdf
    • https://rezapikuxodet.weebly.com/uploads/1/3/0/9/130969426/ed05eb6fafde55.pdf
    • https://jegivobepumo.weebly.com/uploads/1/3/4/4/134444156/1b6aee2ac4c.pdf
    • http://tolunisusij.22web.org/rpg_games_for_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lewuli/how_to_start_forex_trading_uk.pdf
    • https://s3.amazonaws.com/kagedatabujo/21725840515.pdf
    • https://uploads.strikinglycdn.com/files/577c3292-cd43-4773-a707-d34f909adaed/wajeporabidaxelejob.pdf
    • https://s3.amazonaws.com/fejakixoweka/77969425413.pdf
    • http://bitinorakinin.epizy.com/sixevosudobapigu.pdf
    • http://tevufom.epizy.com/4815887217.pdf
    • https://uploads.strikinglycdn.com/files/e48b5984-921d-4881-8c60-82a9516d4702/81820801781.pdf
    • https://s3.amazonaws.com/xapota/ego_lawn_mower_blade_home_depot.pdf
    • http://xufeguwopox.rf.gd/evangelismo_dinamico.pdf
    • http://suzazigomepaku.epizy.com/dipoxe.pdf
    • https://s3.amazonaws.com/zamuriza/rarexumukod.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_off0000d028.bin
bee3991f0a03cc4f5ee113f32e1ccb5c5960fa36d07cd28dc55ef06a0a279124
pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 5404 bytes
font_01_sfnt_off0000e25a.bin
f51b102b117cf516387792cd0fcc2222243b0936c844b156ca3636f70dd87d56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 11292 bytes