Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1a5122210cc289…

MALICIOUS

PDF

81.5 KB Created: 2021-05-15 20:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0cbd7cccfb99e3d2e1e2cbe8ab1ca998 SHA-1: acc11b791a6f95eb5399397be1d9656a6ca48786 SHA-256: 7f1a5122210cc289eb2d1f373672ba0a84284e35cb4c2a018bb19f078e9c0179
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links on disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

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://jottigo.ru/strik?utm_term=dark+alliance+2021 PDF link annotation
    • http://lozejebivo.scienceontheweb.net/how_to_clean_a_dirty_mop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366055/normal_5fee2051ded66.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/laboritufewubivopi.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/94259e238c47.pdfIn PDF document text
    • http://vobigabifinu.22web.org/firanofelex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_6057209521dfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5ffc86991ba61.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/club_car_ds_starter_generator_rebuild_kit.pdfIn PDF document text
    • https://sarogixi.weebly.com/uploads/1/3/0/8/130813770/wozite-juwodarep-joxugagu-zojurifare.pdfIn PDF document text
    • http://pugezesiw.mygamesonline.org/system_performance_brendan_gregg_free_download.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/7782891752.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/the_tourist_game_steam.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/968d8bd1-17e1-4d1a-9f28-1024c5e5a135/vuserovivomokifekodomab.pdfIn PDF document text
    • http://mujaxuzapoli.epizy.com/504_toefl_words.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/megaro.pdfIn PDF document text
    • http://noderukun.epizy.com/sownictwo_dom_angielski_wiczenia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2ed35a-cc22-4851-8710-7095cd14df69/14300219242.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/tipers_sensemaking_tasks_for_introductory_physics_answers.pdfIn PDF document text
    • http://ziduwor.epizy.com/food_and_beverage_knowledge_test.pdfIn PDF document text
    • http://xikepidefam.epizy.com/android_mobile_app_templates_free.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_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 5004 bytes
SHA-256: 5aaf8aef918a943c8fe6378937a6452ad59122691395eb8f67ac25ebe005bd1e
font_01_sfnt_off000111ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 11576 bytes
SHA-256: 9747589d98b560419974bc69762decf36868961f9475a44a4530f168010e4281

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