Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e1c693d2633c46…

MALICIOUS

PDF

93.8 KB Created: 2021-05-18 20:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 997fbc0da0c1e4fe90ea6bc97fc714a5 SHA-1: 1234e84bc352c46ce34e11c6ce2f7840f372f933 SHA-256: b7e1c693d2633c46e3541322fa0c3796eaafc259fde016194ca890587b00b3ca
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=financial+markets+and+institutions+saunders+pdf+download PDF link annotation
    • https://zesijedoroge.weebly.com/uploads/1/3/4/3/134372038/f9c4ccda73363b.pdfIn PDF document text
    • https://tozikogok.weebly.com/uploads/1/3/5/3/135330875/9059557.pdfIn PDF document text
    • http://bobixuposu.22web.org/amsterdam_metro_tram_map.pdfIn PDF document text
    • https://polatoni.weebly.com/uploads/1/3/1/3/131379392/pijoturerof-pixalevutama.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/cbee7b99-ea57-40c4-9ea5-acb10899326e/gupidoledaneledejik.pdfIn PDF document text
    • http://vepilezora.epizy.com/damian_marley_medication_instrumental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f372c7e9-709f-494e-885e-e6a7314858c8/2012_dodge_avenger_v6_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9aac56-241d-4247-9120-8186c39ba692/rodugomupaxowuleran.pdfIn PDF document text
    • http://dufogatate.epizy.com/radolumaxivarok.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/adding_fractions_and_mixed_numbers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/how_to_add_drivers_to_windows_7_iso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5384b019-1206-411f-9aea-6ad98307ffbe/62043778532.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/bad_blood_carreyrou_book_club_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60315e9f-d130-499b-a57e-30cb1bb07b18/jusaterutasomikim.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/dogiwel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34165d7-c89c-499c-8f66-296fb435adba/what_is_stephen_hawkings_medical_condition.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_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 5412 bytes
SHA-256: cc64528c8cae3c37e1dacdec40e440fd1e89ac301273fd0830b14dbf930c40c1
font_01_sfnt_off0001422f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422F 11704 bytes
SHA-256: cecf2037e6eee02a88da0862f7fa101bb235fcd6afca681e97f03abcd41713e2

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