Malicious PDF — malware analysis report

Static analysis result for SHA-256 305e94fc1583f424…

MALICIOUS

PDF

69.9 KB Created: 2021-02-02 11:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 18863b9b38cc6679e89827d1d288d4dc SHA-1: 413ee5e864c5074ad533ccd0dea67d0e52fe9e45 SHA-256: 305e94fc1583f424d35c07c4dc4ec9873882fa1033463d93ad5873f28c477d5b
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to socially engineer the user into installing a browser update or extension. While no scripts were directly extracted, the presence of numerous external URLs suggests a downloader or redirector functionality, likely leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jacksth.ru/aws?utm_term=adobe+acrobat+dc+2015+update PDF link annotation
    • https://cdn.sqhk.co/vovewotutal/kiai1FB/47878421728.pdfIn PDF document text
    • http://timelessdecorum.com/470791011669u08.pdfIn PDF document text
    • http://all-gopro.com/5630681390530ft8.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/iNRib7I/dojejemomifukuwezoregos.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/iegcI5e/religion_simulator_apk.pdfIn PDF document text
    • http://vermono.site/rejaxuzawawifasabuxyosk0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5fd3d11f3f914.pdfIn PDF document text
    • https://cdn.sqhk.co/taranumota/vggqaVt/21233641350.pdfIn PDF document text
    • http://copyrightviolationcenters.com/wewive75ouf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_6010047505271.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/ibjePMv/blacksmith_merge_idle_rpg_hacked_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/jdFihis/candy_grabber_mini_claw_machine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_60067a80b210f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413867/normal_5fef0b51df0b3.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/2P1DFhj/funny_tiktok_videos_for_whatsapp_status.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dajejat.rf.gd/wupetoxabapi.pdfIn PDF document text
    • http://molulig.epizy.com/carpigiani_van_1_machine_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 5164 bytes
SHA-256: 023609fc1a4619d6050339c14fd403ea3931ef34121f8408b900c1c9a0f81b7d
font_01_sfnt_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 10812 bytes
SHA-256: f69a22357250c2a9c35ba11048cd460804b73c34e3a7daeb4373f469860eb338
font_02_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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