Malicious PDF — malware analysis report

Static analysis result for SHA-256 421ef209dc1b6244…

MALICIOUS

PDF

87.4 KB Created: 2021-03-10 23:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 875fbe975d6ffca8117ab4619be7c723 SHA-1: b31d8f288a6ad382c3e1f3b902967ac0e6b22a08 SHA-256: 421ef209dc1b624473e27c7f28f0656ffe2b6e8e0b1141a4d0a51506130b5c26
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://dafemum.ru/123?utm_term=android+automate+flow+autostart
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/guvamelalexob_xuxenajasob_funizijamoku.pdf
    • http://pefiworawodud.mypressonline.com/gravity_falls_journal_3_blacklight_edition_ebay.pdf
    • https://cdn.sqhk.co/bisuligiga/ifibhba/best_cloud_backup_storage_for_pc.pdf
    • https://cdn.sqhk.co/xarozowuzosa/gjpRjbA/police_pursuit_live_now.pdf
    • http://xutefizil.getenjoyment.net/satatovufo.pdf
    • https://cdn.sqhk.co/bulenupulabo/hjdOshi/hmrc_tax_refund_text.pdf
    • http://kexufiloruruki.22web.org/can_you_netflix_shows_onto_laptop.pdf
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/a528d2cb782f.pdf
    • http://doworevo.22web.org/south_carolina_drivers_manual_2018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kixozixid.rf.gd/lonarukaruse.pdf
    • http://pobalupusovejo.epizy.com/rogue_leveling_guide_classic_wowhead.pdf
    • https://uploads.strikinglycdn.com/files/64cd8eab-74c4-407a-85c0-92fd993a30a0/70361821731.pdf
    • https://uploads.strikinglycdn.com/files/d9f62f3d-def7-4bce-b6f7-15d32fb9b02a/79772835278.pdf
    • https://uploads.strikinglycdn.com/files/d6576296-aea9-4fd8-b66e-5e0399739713/fuwiwenijiralubawu.pdf
    • https://uploads.strikinglycdn.com/files/f9d24d33-2175-4f4b-a04e-791b8865f8e8/how_to_change_the_battery_in_garmin_vivofit_2.pdf
    • https://uploads.strikinglycdn.com/files/1304a676-bc30-40ac-bf3e-7a11d1ae12a8/how_much_does_a_windscreen_chip_repair_cost.pdf
    • https://uploads.strikinglycdn.com/files/7e051c2f-7132-4de1-ac4d-ee720d41c68c/stark_trilogy_book_4_read_online_free.pdf
    • http://tativukowodugox.epizy.com/what_is_private_equity_in_simple_terms.pdf
    • http://dowafirowelumex.atwebpages.com/design_patterns_interview_questions_and_answers_c.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_off000115a4.bin
5589dc39728dabe3855553ba2059a9f5998dc3aecadba6443356a8297bc0ca69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 5136 bytes
font_01_sfnt_off0001271b.bin
e4a57d8a1032ce9d620665c5d25b24275b79557480c1c17a799c64678a27a650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 12000 bytes

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