Malicious PDF — malware analysis report

Static analysis result for SHA-256 62be023194141fbd…

MALICIOUS

PDF

75.2 KB Created: 2021-05-13 23:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99dde3a6239bf91f1d4f078d7680c666 SHA-1: 1ac7c8db7dbf54defbca7f0bceb36f2a37844895 SHA-256: 62be023194141fbd2222d3a59d1836b1c5723a32d4ba85a15657ad29506c55c4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and acting as a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jumiwimov.ru/strik?utm_term=united+limo+o%2527hare
    • http://wamuvosuvebupa.iblogger.org/msbte_model_answer_paper_i_scheme_app.pdf
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/8272912.pdf
    • http://datidino.iblogger.org/fantasy_football_bye_week_cheat_sheet.pdf
    • http://kovuzaxaf.medianewsonline.com/vuxojitewubudamarizijuk.pdf
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/635974.pdf
    • https://cdn-cms.f-static.net/uploads/4484380/normal_6064b15468dd3.pdf
    • https://static.s123-cdn-static.com/uploads/4475570/normal_5ff8aa94763f3.pdf
    • https://cdn-cms.f-static.net/uploads/4471091/normal_60230e2b5c3c6.pdf
    • https://wuwogijate.weebly.com/uploads/1/3/4/8/134886767/7395412.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dorurefu.epizy.com/the_lion_witch_and_the_wardrobe_movies.pdf
    • http://bugazepoja.onlinewebshop.net/underwater_acoustics.pdf
    • https://s3.amazonaws.com/turip/good_employee_evaluation_report.pdf
    • http://topatux.rf.gd/latutinozuruwazobewalib.pdf
    • https://uploads.strikinglycdn.com/files/ca8db15b-f062-4ab2-ba59-94c747d7a793/star_wars_logo_bookends.pdf
    • https://uploads.strikinglycdn.com/files/f2b1749c-abb2-4132-9bad-b6e47a1e9b18/renodidisowoxudafuwomave.pdf
    • https://s3.amazonaws.com/gogonof/bhangra_ta_sajda_song_raagsong.pdf
    • https://s3.amazonaws.com/jolituzoji/exerpeutic_folding_bike_reviews.pdf
    • https://uploads.strikinglycdn.com/files/f7a46684-6c43-4562-9ca0-3b303c01d47e/godaddy_wordpress_hosting_free_ssl.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_off0000e831.bin
04b5f296b01b2e2ed50aad2499f3931f1db5ee0d9b4217cbfbcc546060db8fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 4912 bytes
font_01_sfnt_off0000f8bb.bin
fb4de9a972ad499c75fb26abc800c1c416f5967fbf9082a5e58be22f5be265a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 11072 bytes

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