Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bfddd87592e06e…

MALICIOUS

PDF

71.8 KB Created: 2021-04-10 12:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2950ca600252ad507c06892c3cfe8eb7 SHA-1: 56eb7628bed243de28dd80deca738ba823b18bd1 SHA-256: 81bfddd87592e06e5771a5d318171f34a242fb94d8d2dec071995bc633170e48
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain metadata related to search terms, further supporting the lure. No scripts were extracted, but the presence of numerous external links indicates a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=agatha+christie+poirot+series+online PDF link annotation
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/vififasaken.pdfIn PDF document text
    • https://giruveme.weebly.com/uploads/1/3/4/4/134480937/gurazosatapo-fufimapodukuw-mizaxatagiw.pdfIn PDF document text
    • https://cdn.sqhk.co/japokaxe/ZU7hdhc/the_triple_alliance_nations_were.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_604ee68bb08bf.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/iDhjBia/xegowusiginebazexiziwin.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/3ad0f9a811353d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422368/normal_6008c0e1436ec.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/refuzimusipiwuw.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/245a5b7a-0012-4663-aff0-2fa3e7a8dfe6/how_to_adjust_squelch_on_baofeng_uv-5r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a22d8e6-d289-4312-a1d7-172c42a30d40/how_to_register_an_att_cordless_phone.pdfIn PDF document text
    • http://fedonefekipide.myartsonline.com/lejozagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc0968b-cf24-4f31-9d66-2117982e9837/which_is_the_best_robot_vacuum_cleaner_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181313a4-3881-4115-8709-630af76498aa/white_tiger_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a97326-b12c-40b3-ac62-b1c76248fd2a/actron_autoscanner_plus_cp9680_manual.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/being_peace_review.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_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 5184 bytes
SHA-256: 0e043aa91bef58dea57ad0c83a76fe05ad46d8068e8f9c028355553faf8c0112
font_01_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 10492 bytes
SHA-256: 04a4444db8929bc9a65c1041367d70efd147690428e7d09e5a53de2dfd40ddf1

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