Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fb6b1f199dd2fa…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 02:37:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c21cda3e59f017ad56822d2de3d56e4 SHA-1: 136749baf75c270b49494a9b90f0af9e879d29f1 SHA-256: b6fb6b1f199dd2fab73dbede686cbdec139f476b3dc4d3823f49237e4a01ec50
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update, which is a common method for malware delivery. Heuristics indicate it's a phishing and potentially a trojan, with ML classification scoring it as highly malicious. The embedded URLs likely serve as download sources for the malicious payload or further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://vilenefex.ru/wix?keyword=so+sad+today+pdf+download
    • http://fonudesuwobulud.mygamesonline.org/85123493184.pdf
    • http://kawasus.scienceontheweb.net/70981105920.pdf
    • https://cdn-cms.f-static.net/uploads/4385021/normal_603327cc2195e.pdf
    • https://cdn.sqhk.co/baxemazisod/1252xjj/13682387577.pdf
    • https://cdn-cms.f-static.net/uploads/4421042/normal_6050d3f283eaf.pdf
    • https://cdn.sqhk.co/kevapaboxer/hjjie6k/finewadadojowuwezeg.pdf
    • https://cdn-cms.f-static.net/uploads/4488330/normal_6052d767728b7.pdf
    • https://wavujosivisero.weebly.com/uploads/1/3/2/7/132740585/442236.pdf
    • https://fusorebumobem.weebly.com/uploads/1/3/3/9/133986296/duzakonaw-wavopalufa.pdf
    • https://cdn.sqhk.co/foroboreb/diaryf9/halloween_store_staten_island.pdf
    • https://cdn.sqhk.co/wuvupalib/gjjhg3w/12348436821.pdf
    • https://static.s123-cdn-static.com/uploads/4490542/normal_5fed6c84c9ae3.pdf
    • https://nusiteraj.weebly.com/uploads/1/3/5/3/135347212/wowevalog-pisatat-mofezozop-titivex.pdf
    • https://wewowalowumuv.weebly.com/uploads/1/3/4/0/134040384/43d99f.pdf
    • http://fagilef.getenjoyment.net/95892341275.pdf
    • http://jojidasusesot.sportsontheweb.net/malikigizuvaletabolu.pdf
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/lanigoxo_muzaxokubadopi_menowi.pdf
    • http://niwopofe.scienceontheweb.net/audio_books_mp3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8e8e4d8a-ac6f-4352-be2a-9ba734306920/61930990135.pdf
    • https://uploads.strikinglycdn.com/files/d3244c52-622f-43e0-aed9-876fce5407aa/bunker_hill_security_camera_password_reset.pdf
    • http://bidusibebawuz.onlinewebshop.net/shark_vacuum_and_steam_cleaner_combo.pdf
    • https://uploads.strikinglycdn.com/files/6d4d5738-8cc3-4886-b719-bb95999d0611/62106372.pdf
    • https://uploads.strikinglycdn.com/files/01c167ec-2ef6-4570-90a7-787b940de8ad/duduziborazegoledolaju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95b.bin
1f0476f441af30dc2d93a897e9a64a799282ae9041b66cb91a175f001c4eaa08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 4860 bytes
font_01_sfnt_off0000f9f9.bin
b4e33f7b3269f23ffce3bd52667a388e2a0c6ca26bd5c08e84014053eaa72d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 10864 bytes
font_02_sfnt_off00011f2e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 4324 bytes

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