Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5552d0f1c2a4fb2…

MALICIOUS

PDF

274.2 KB Created: 2021-04-09 20:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a5f5e21733097d7703ace418e001f61 SHA-1: 5fb233ae04633957a8b81d7a2f5ab78e1ab9b7a1 SHA-256: f5552d0f1c2a4fb2b5bf469f7f19a50abb1c6016f434c6d0e6a2bda525ae91dd
112 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a phishing lure with urgency language, paired with an embedded external URI. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI point towards a likely attack pattern of directing users to a malicious website for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kuzutuzo.ru/strik?utm_term=fountainhead+book+plot
    • http://vegoletox.medianewsonline.com/gevadu.pdf
    • http://degifutuv.scienceontheweb.net/gofemofawotove.pdf
    • http://kosamaritaj.getenjoyment.net/weight_loss_diet_menu.pdf
    • http://tezuveripoxub.mypressonline.com/balanced_scorecard_espaol.pdf
    • http://jakusavu.sportsontheweb.net/16366922121.pdf
    • http://zdorovie-vashe-vse.xyz/mezutopabarepanujumadimxowy.pdf
    • http://ruxuzosok.mywebcommunity.org/is_focusrite_scarlett_solo_good.pdf
    • http://about-igsupport.com/how_to_make_dark_brown_colour_by_mixing_two_colours0lhrr.pdf
    • http://dokaxirugik.medianewsonline.com/fabuxapipexopaziduwopufe.pdf
    • http://liketime.fun/bigg_boss_tamil_season_2_promo28uy0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ebc07f01-ddcf-499a-a168-298c3594b933/17181119054.pdf
    • https://uploads.strikinglycdn.com/files/5e815dd2-47b8-4a2a-a838-bf8bcfb7bb10/side_by_side_book_1_chapter_15.pdf
    • https://uploads.strikinglycdn.com/files/db141fb4-6ee0-4909-bf2b-4204bdb83006/tci_history_alive_7th_grade_study_guides.pdf
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_d7c801681070499f9fc9d3bffa0dfb0e.pdf?index=true
    • https://s3.amazonaws.com/vavale/whatsapp_plus_latest_2019.pdf
    • https://uploads.strikinglycdn.com/files/5f813fa7-8266-4554-bf67-b8180eba6bdf/neverending_story_horse_death_real.pdf
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_f22ec461476a433aaeebe9aff15bb928.pdf?index=true
    • https://s3.amazonaws.com/nazekisigiduz/rijolitebavasosujoganuw.pdf
    • https://s3.amazonaws.com/mujesogi/69510199593.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_off000400f9.bin
c1a89ff10d0b5ba0bafdd63554b6e9dbd4420072ad5c9b275a417f630ef8ceb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x400F9 4932 bytes
font_01_sfnt_off000411bb.bin
083ddb97056b0f063d760e197eb1a267436199391b7f9d318837c137427dfc22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x411BB 11828 bytes

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