Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f757392d2965d4…

MALICIOUS

PDF

91.7 KB Created: 2021-05-29 23:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c2df8d2e391d97f44531d81fcc934eec SHA-1: 9003f2d229d411f628ba9fbb4f0eed55a9a24e6e SHA-256: b6f757392d2965d4c0f088db071d61a05e78f955862f1229b93c09bac1eeb201
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://kuzutuzo.ru/123?utm_term=allahabad+university+application+form PDF link annotation
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/05639fec5.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/riwor.pdfIn PDF document text
    • https://kebakiwaranug.weebly.com/uploads/1/3/4/3/134317860/juzexisen.pdfIn PDF document text
    • https://xizovetezewo.weebly.com/uploads/1/3/2/8/132814166/zebelewobaxixomiwede.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/zozakosilatot-keperutisipog.pdfIn PDF document text
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/zodure.pdfIn PDF document text
    • https://vuledojovux.weebly.com/uploads/1/3/5/9/135962602/nupokupujiliseg.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/werujugaronoka.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/7185273.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/f110c45c-4d58-4afa-a837-5c66c86814d7/purabejakifeloli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9da0a5-f5b6-4796-afd9-d977ad9d0b43/89175899140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9845c2e6-6616-4c94-8927-767f0d7e5f2e/el_seor_de_las_moscas_personajes_caracteristicas_psicologicas_y_fisicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4053f39b-3ec9-416a-b253-a55b10707692/54910927061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adc316b-2f70-4d20-92e8-862531be0e14/kebabixurowaboguteta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11cb314-661a-48d6-bcf3-af56fc92afc9/47219377614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e88a403-726d-44ba-b31a-1c535b24885d/delonghi_tch6590er_ceramic_tower_heater_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d4face-353d-4545-a941-f52e888df671/23518973496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995aa696-a36b-48cc-b73b-9237acb41f28/36318487820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef6c356-48aa-4318-bffa-30b8e7afd3bb/what_is_the_story_monkeys_paw_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/044d4e6e-efb8-493a-8da0-d93558c310ba/tewojesoborodirowolumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41782502-a06a-478e-9b5f-7fe6088fe3c7/paper_airplane_powerpoint_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41975b3-5dee-4ec0-bb7a-0141d22eb033/bolt_action_vs_semi_automatic.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_off0001263b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263B 5684 bytes
SHA-256: 94eede4e53998df661fd6903329addcb6b831b863503f5a75889b92a98486f9c
font_01_sfnt_off00013972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13972 11612 bytes
SHA-256: 9dae86808c1c6370c977fce50043aa25a380e1385299a275e52a79d2318f4770