Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8902b68c900327…

MALICIOUS

PDF

76.5 KB Created: 2021-04-17 21:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f454b9126570624fecfa0a5606b3897 SHA-1: d507c4e19cd041303b210594152644d850f3f827 SHA-256: 1a8902b68c9003274374de1766c7ce0a38f0e92f6d75264fd9ee55ed5d208a72
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'Browser extension / update installation lure'. The embedded URLs and the presence of a link farm suggest an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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/strik?utm_term=python+3.6+download+for+windows+10+32+bit
    • https://cdn.sqhk.co/romilononove/fH9dPoj/jefirarolaziri.pdf
    • https://cdn.sqhk.co/vapiwibisa/1VjfjbX/sherlock_holmes_story_malayalam.pdf
    • http://swiss-gear.shop/tabla_periodica_a_colorts3pz.pdf
    • http://e-devletturkiyeaidatsistemimgovtr.com/suzoforakokotezebaxafe63230.pdf
    • https://cdn.sqhk.co/golemejexeno/ihpgo9s/jigawisiderenijitobuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/083198e2-3ebd-4e10-b96c-8aed40335227/64373982411.pdf
    • https://uploads.strikinglycdn.com/files/e3afc539-9359-4d25-8407-501266c91b50/how_to_thread_a_brother_xm2701.pdf
    • https://uploads.strikinglycdn.com/files/cc890c4e-5745-41be-b7fd-3ab70d676c4a/amazon_fire_10_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/b791856f-8927-4836-9108-7cfc252e26ae/maus_2_summary.pdf
    • https://uploads.strikinglycdn.com/files/83ead893-a5c0-40b7-a501-02823617eac0/christmas_carol_lyrics_printable.pdf
    • https://uploads.strikinglycdn.com/files/17e4c112-eacd-48fb-8229-0d6eb591ccf5/funcion_y_estructura_de_un_texto_instructivo.pdf
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_6bcca517aa144ddc863e5a392f99d4bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/affd8532-0d83-42af-a9c4-8aa0d65efd59/scid_5.pdf
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_f286247eb50541fba2478ae95f557d95.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4fe1544d-1fcf-454a-8a55-16eb39590f7b/what_is_the_latin_word_for_prayer.pdf
    • https://uploads.strikinglycdn.com/files/cefa587d-5750-4528-af1e-dd07726b8c36/pojefiwalamevagifog.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_off0000eaf0.bin
38c99ab2a7ef13cffc975adc42c5dd97c968394a4de21f7c849a0b032f61f3ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 6008 bytes
font_01_sfnt_off0000ff7b.bin
ae829681ddd421386f0bc75f7099caebd5cb3e7cea87187540beef47831ece6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 11044 bytes

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