Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b41f5ec62765aca…

MALICIOUS

PDF

97.1 KB Created: 2021-03-23 12:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a61be4fa478406d5d5cd2b0f512b4ad SHA-1: c64b73ba9861c4c8537e80a4442506435b7a7f45 SHA-256: 5b41f5ec62765aca14ea4139c3910bfd7f6732c52bbc20bbba868a1f2e77251d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, likely designed to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/award?keyword=safety+data+sheet+sections+pdf PDF link annotation
    • https://cdn.sqhk.co/tumupowe/idnFIsb/harris_scarfe_jobs_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/bitulore/gdjd7jh/got7_lullaby_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/dhejjgx/71209091662.pdfIn PDF document text
    • http://unosital.space/558839455772ppu6.pdfIn PDF document text
    • http://amsidisi.xyz/puxokyvkc3.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/girard_tankless_water_heater_problems.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/tower_defense_simulator_roblox_live_eventhg9e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5fe6b66ca21ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_600c72ae9604c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_60150e4643b7d.pdfIn PDF document text
    • https://cdn.sqhk.co/gorubabor/Onnichg/romancing_saga_2_dantarg_3rd_form.pdfIn PDF document text
    • http://sodahub.pro/97073576520mnl6m.pdfIn PDF document text
    • http://tanubujurutemut.scienceontheweb.net/36087352920.pdfIn PDF document text
    • https://cdn.sqhk.co/tijovomiv/ecifiit/nikefuvobewoxusefojugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485569/normal_5fdbeb0428c93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e799bae3-fdd6-40f7-9b74-9ac67f148c83/petty_cash_verification_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af48d953-7402-47fb-b8aa-4fc6410332ab/dave_ramsey_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7a3348-c6b6-4223-b241-de455cefd92d/2010_camaro_ss_supercharger_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f5b078-42f1-43e1-8914-2722dcfb2421/vurat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69a6759-6c8e-4e04-8e3a-b71847f78b03/77278739128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbfd610f-5631-422e-81ae-48d799ca66a8/scarlett_18i8_2nd_gen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349faa93-d40e-44b4-a7df-282e08b69cff/best_auto_repair_shops_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19033777-f42c-4c2a-a741-436b48561ac6/how_to_thread_a_kenmore_sewing_machine_model_5186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9986d06-bd9f-485a-98c8-017b2b59c1c1/74492399167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98e6f35-6076-4332-a6ef-e4e606d9a21a/pampers_left_right_baby_shower_game.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D59 5320 bytes
SHA-256: 0bb379181a534006b34624f170d763805862ee575b52c931b5f9a9a0d8993566
font_01_sfnt_off00014f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F84 11556 bytes
SHA-256: 67dcdb20033d4d3659923d7913392203299e866fb9de7f67a1dbb91e3c0b42a4