Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa82f0aad72ffb9…

MALICIOUS

PDF

68.4 KB Created: 2021-03-03 16:36:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9af83b00d83ae587d003f9b1a1f624a5 SHA-1: a4855f167cdb687707157874e9757853f380c66e SHA-256: 9aa82f0aad72ffb9499d2584429403262fd5fd47b931a79f39eec3b589b9f81f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily garbled, contains text related to a book about drug trafficking, likely a lure to entice users to click the malicious links.

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://zajinet.ru/123?utm_term=libro+historia+del+narcotr%25C3%25A1fico+en+m%25C3%25A9xico+pdf+gratis PDF link annotation
    • https://zokutiwako.weebly.com/uploads/1/3/0/8/130873782/lipivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_602140b9e0b82.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/what_is_the_short_story_charles_about.pdfIn PDF document text
    • http://xekuluw.iblogger.org/2018_fantasy_football_cheat_sheet_excel.pdfIn PDF document text
    • http://gazagidumow.mygamesonline.org/autocad_architecture_2021_tutorial.pdfIn PDF document text
    • http://vapusokupasaz.iblogger.org/activate_a2_answer_key.pdfIn PDF document text
    • http://tegikelekosux.22web.org/maple_leaf_rag_piano_sheet_music_original.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_602c6c1473fb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_603eb85689de6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417137/normal_6002e49e7b8ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_5fd67f20e3d05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livixow.epizy.com/waiting_for_you_images.pdfIn PDF document text
    • http://vufagemabon.rf.gd/urine_dipstick_results_sheet.pdfIn PDF document text
    • http://wekolaxoretewov.epizy.com/67224740908.pdfIn PDF document text
    • http://pasejisozud.rf.gd/49428335738.pdfIn PDF document text
    • http://fiwofitobuz.rf.gd/math_worksheets_grade_5_division.pdfIn PDF document text
    • http://sigenuze.rf.gd/miss_world_2016_winner_question_and_answer.pdfIn PDF document text
    • http://giduzorim.epizy.com/29332873811.pdfIn PDF document text
    • http://xifawuzegeliwag.rf.gd/pofilazelebafibibod.pdfIn PDF document text
    • http://noworevapetero.epizy.com/biometric_technology_ppt.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_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 6092 bytes
SHA-256: 269c90bd017a5a368e66a6c19c2646f1929b7f81b9224c709bf6035eac0414e6
font_01_sfnt_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 10656 bytes
SHA-256: 0f407d84b3647c851650d6777c5cf69ed606c24b62c11031b4850fbf148b381f

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