Malicious PDF — malware analysis report

Static analysis result for SHA-256 230bbaed5b4d9aee…

MALICIOUS

PDF

118.4 KB Created: 2021-03-24 11:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eb2d477c210a4ef2008731d4689f2c7f SHA-1: 0b52310a619258d137dc3b840c69e0dc7f4ef8c2 SHA-256: 230bbaed5b4d9aeef02fb626b2fa2b5adf99abe66341e3ab4e347e0eff0f864a
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, possibly exploiting PDF vulnerabilities or serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/123?utm_term=pt+bd+sharma+date+sheet PDF link annotation
    • http://sdfafq.info/sefozekusovatyd0ag.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/rupal.pdfIn PDF document text
    • http://help-violation.com/66392336635hn8el.pdfIn PDF document text
    • http://rufajegenene.iblogger.org/fuberuzorenamug.pdfIn PDF document text
    • https://sebumowuvuxeluz.weebly.com/uploads/1/3/5/9/135962316/wonam-kidoxip-kofidigerove.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/33a4c148-071a-4d9f-b8bd-02efd120b000/baby_name_books.pdfIn PDF document text
    • http://mupigedosawi.epizy.com/whats_the_best_call_of_duty_game_for_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91bc1ad-7d55-4d1c-8e50-523e08a68ffd/how_to_learn_data_science_from_scratch.pdfIn PDF document text
    • http://zukixewagiv.epizy.com/rinesatakedivotuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a3fa8b-6e87-449d-bb7f-496f64b4f1ec/garmin_echomap_50s_firmware_update.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/best_digital_agency_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/what_to_do_if_your_firestick_remote_doesnt_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27026f7c-456b-4514-b566-c095928c52bf/mebuzuxawixitaxulanaka.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_off00019461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19461 5172 bytes
SHA-256: 818a9aa551c955b11425d7114cb1816c4d9087ae9f8a8e90cb04bcccc2eef113
font_01_sfnt_off0001a5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5C7 11352 bytes
SHA-256: 2d5d4dbaf3dd15d95b7e7263032ce13f7c21b0e132efa56e82e15b70883ec798

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