Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe235b717d02714…

MALICIOUS

PDF

92.2 KB Created: 2021-06-08 05:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4119f52128d34adccd91b4fa24702cca SHA-1: 56f2372837f8fa211e4377014dc03b893c35c8a6 SHA-256: 8fe235b717d0271449a7d8e7941ea02df91c2e51865b07a31b4908e47fc07717
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 a primary suspicious URL pointing to 'synerhu.ru'. The document body, though heavily obfuscated, suggests a lure related to 'tattoo machines diagrams pdf', indicating a potential phishing or social engineering attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/pbw?utm_term=tattoo+machines+diagrams+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484383/normal_6018898290e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_604d82bd15e06.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369919/normal_60b623b12225f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_6022eb5036c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_605796bda5d90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_60388cf6a06bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_6037824a0a37c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379602/normal_5fce5c56cb01e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475988/normal_5fc7268a7240a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_60216bd5c8a51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_602e475b8f2ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_5fe7246637eb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://barumena.pbworks.com/f/50801922713.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144446886/netigurafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2543bc7e-183b-419f-a5d8-dd48dd2c9903/70948126486.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144818442/application_forms_for_nsfas_2019.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144516039/how_to_report_damaged_baggage_american_airlines.pdfIn PDF document text
    • http://vobaranizume.pbworks.com/w/file/fetch/144830499/voridadazusosagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8c0116-1282-45a0-9861-cc028275ef4f/samsung_hw_h550_manual.pdfIn PDF document text
    • http://giribuv.pbworks.com/f/stuck_in_the_mud_picture_book.pdfIn PDF document text
    • http://jagimikat.pbworks.com/w/file/fetch/144669813/govogufusutiler.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/f/87062011028.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/f/69267625278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b8ceda-5f64-4018-883c-7894dc92217c/25738901774.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_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 5488 bytes
SHA-256: 4c90dc4557bf37e3c3db9e67a60a4739f7b4849830b045f8d22cc53b290e3ba3
font_01_sfnt_off00013ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE4 11568 bytes
SHA-256: be1e4325a34e97109d5e6818eec7b55ceb905e0701ae9721449e90224ca31e12

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