Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fc72cd45bbcb85…

MALICIOUS

PDF

74.5 KB Created: 2021-03-19 18:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9e110cdc9a28aca0f19c86bfeffcef95 SHA-1: 255ba78f19e58eaabb069d05839e12faed559f9d SHA-256: 17fc72cd45bbcb853c9f0dc0b8fc03e02ad3fd2e8642289cace297b723e55c22
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document is a link farm on disposable hosting, reinforcing the malicious intent. While no scripts were extracted, the sheer volume of suspicious links and the ML classifier's high confidence score point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vilenefex.ru/strik?utm_term=machinery%2527s+handbook+29th+edition+pdf PDF link annotation
    • http://tujemet.scienceontheweb.net/76885186886.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/41039118482.pdfIn PDF document text
    • https://cdn.sqhk.co/pifitudebuxo/zXfihT2/big_bang_theory_cast_members_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/ijj0ifc/battlelands_royale_pc_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_601114f149bf1.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/gca0jgW/car_mechanic_simulator_2018_ps4_dlc_release_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454436/normal_5fe0210e58288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff4d96c75dbe.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/bhigfha/videos_de_zombie_prison_escape_saw_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/Fhhjaig/6252543773.pdfIn PDF document text
    • http://xakubilowiva.22web.org/certificat_de_cession_vhicule_gratuit.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/52823a68-72d4-42a3-a70d-825ab5e8f65f/binojuwudelogosit.pdfIn PDF document text
    • http://doxekapop.rf.gd/plural_possessive_nouns_printable_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a68aeeda-733e-4cfd-9ad2-b10282c8c8a0/instructions_for_delonghi_oil_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/lapelow.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/38139238266.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/badger_5_garbage_disposal_leaking_from_bottom.pdfIn PDF document text
    • http://sizemogigu.myartsonline.com/australia_states_and_capitals.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_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 5844 bytes
SHA-256: e78d26b6039205329774d6c17b556382290fe5ce56804d2783e75177564948f9
font_01_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 10708 bytes
SHA-256: 1235d8b05797929b7224bfd13b59ebd8d319c0254dd39ea9639f05a64514440d

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