Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef2b287050342d2…

MALICIOUS

PDF

83.6 KB Created: 2021-03-22 08:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffa08771b114a3bcfa189370f8f10ad3 SHA-1: 33a5dfc3f5c829a28c937b92e7ab030b5f4ea781 SHA-256: eef2b287050342d23dd634b9f6510cbe595b1c845a6e50d619919eb45b521425
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious and likely phishing-related. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URLs indicate a common pattern for distributing phishing content or second-stage malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/123?utm_term=apache+solr+7.+3.+1
    • https://cdn.sqhk.co/livoluxuwad/EygfrPP/offline_video_calling_app.pdf
    • http://pukujadud.getenjoyment.net/93831736234.pdf
    • http://rujisuki.mygamesonline.org/por_tu_amor_3msc_libro.pdf
    • http://tiwilofojifig.sportsontheweb.net/68473639327.pdf
    • https://cdn.sqhk.co/juwafajem/nmFiabn/events_near_me_today_for_family.pdf
    • https://cdn-cms.f-static.net/uploads/4369903/normal_6051c08adaa62.pdf
    • https://cdn-cms.f-static.net/uploads/4494138/normal_604377f6f2fa8.pdf
    • http://xirapanagix.getenjoyment.net/annexure_d_for_passport.pdf
    • http://relibafogat.sportsontheweb.net/28534899225.pdf
    • https://cdn.sqhk.co/xosuridasago/XSS0Cij/virtual_music_mixer_dj_apk_download.pdf
    • https://cdn.sqhk.co/wejagamewo/jdhdUgc/spiral_balloon_garland.pdf
    • http://bebalezuve.medianewsonline.com/fenitasuvegivotuzorejel.pdf
    • https://cdn-cms.f-static.net/uploads/4481662/normal_601e1f82930a2.pdf
    • http://gopidap.scienceontheweb.net/80823880229.pdf
    • http://nuxuzuruguli.mypressonline.com/dotul.pdf
    • http://fijexojor.getenjoyment.net/90791733439.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vexolofifete.atwebpages.com/wizards_of_the_coast_retail_store.pdf
    • https://s3.amazonaws.com/kefiperizonofu/twinings_chai_tea_nutritional_information.pdf
    • https://s3.amazonaws.com/nuruvapozixix/42264576063.pdf
    • https://s3.amazonaws.com/tokatefozude/poetry_forms_and_structure.pdf
    • https://s3.amazonaws.com/divelikubapiwaj/civilization_iv_beyond_the_sword_strategy_guide.pdf
    • http://jisijuvod.myartsonline.com/the_maze_runner_2014_full_movie_download_in_tamil_dubbed.pdf
    • https://s3.amazonaws.com/muvarelo/wizegupalubuxinaduxitepe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109e4.bin
3480e504a970cb774cdade9dee87aef5973511fa638c5e9a05476d7cd1dcc6cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 5336 bytes
font_01_sfnt_off00011c0f.bin
fbaf2422c2417e7dcc2381717554047f89b4d5b58c21346bd6361878d4aaa07e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 10884 bytes

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