Malicious PDF — malware analysis report

Static analysis result for SHA-256 78999a4c7b8cafe9…

MALICIOUS

PDF

78.2 KB Created: 2021-03-16 20:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e8479aeefc48173f70de10702610ce87 SHA-1: 28fa055decb60a8658322e587816beb11a4aba29 SHA-256: 78999a4c7b8cafe962a9c4409eecb7fdc8c96db352565084cdf93bc9cb866334
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, including one that mimics a search result for "quenching heat treatment pdf" and another on a disposable domain, suggesting a link farm for phishing or malware distribution. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports the phishing lure and link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=quenching+heat+treatment+pdf PDF link annotation
    • http://jadogaxarabu.mygamesonline.org/novecento_alessandro_baricco_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_6024bf679829e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_6016c3e01fa87.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/dejaluwi.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/jeQRYhh/answer_me_my_love_joni_mitchell_lyrics.pdfIn PDF document text
    • http://grampus-shop.com/husqvarna_323l_trimmer_head_partsrtst6.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/jaggjhQ/best_2_way_slasher_build_2k21_sf.pdfIn PDF document text
    • http://crysety.xyz/wutisopizogobatefawy9oj1.pdfIn PDF document text
    • http://instapresent.site/bumojemazudunachfb4.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/rajcifL/36781179165.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/faLlbG2/vertigo_korean_movie_cast.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/5384781572.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/kzhfWhb/kung_fu_zombie_review.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/d8d4747b-554e-4170-a57d-53d7deb5617f/what_was_chess_originally_called.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/98670506280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b7fd7c-f6eb-45e3-99ff-c7ef578ff46a/kafovimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb57b06-b5a2-416a-a5db-27afa59b8ca1/2017_vw_passat_transmission_fluid_change.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/luloropeselijironil.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/sofopigojoxejezidewunin.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/40948862052.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_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 5420 bytes
SHA-256: 19faa75a376c91b859c386c8a002059f1eaee0d8a2114c7034b0c58372754222
font_01_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 11576 bytes
SHA-256: 4907b6a1682ea27c59e57096616bc30c240379dea30f13e04bc0dc659f85426f

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