Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14a6637fffb4d7b…

MALICIOUS

PDF

79.8 KB Created: 2021-04-05 01:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d2cb737f1f31e94bde194514a57e220d SHA-1: 21e3629578764e6b9819c7c08d9aff938ed8a004 SHA-256: b14a6637fffb4d7bccd501290aa34541a1f26531c898a30b5cef48c0e8c0c03c
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It functions as a link farm, presenting a lure related to 'Urdu books pdf free download sites' to encourage users to click on numerous embedded URLs. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=urdu+books+pdf+free+download+sites PDF link annotation
    • http://esplus.pro/jumibocd0vi.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/what_is_e1_error_in_accu_chek_active.pdfIn PDF document text
    • http://blancer.xyz/39100638680i34ne.pdfIn PDF document text
    • http://kuliwegi.sportsontheweb.net/breast_cancer_pathology_report.pdfIn PDF document text
    • http://arendagg.xyz/how_to_make_nuggets_crispy2pq26.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/hajf0Q5/denopenufuvuzubibu.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/9lYj9Kp/campus_parent_infinite_campus.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/ObgjhzL/password_photo_lock_screen_apk.pdfIn PDF document text
    • http://ozalupa.space/acute_pulmonary_embolism_guidelines_2018jmcbj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/dedepoked.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/zowapatazinikufote.pdfIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_95ee2aff8baf4f4abb57be70e4ba5325.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69b30a5-22be-4eb0-bdf1-90733e559288/cognitive_psychology_theory_of_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/if_you_care_baking_paper_sheets.pdfIn PDF document text
    • https://b47237a6-1880-4d87-9598-f01162bab054.filesusr.com/ugd/1fe0ea_255ec233bd194992bb444249369d8af0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd316df8-46b9-4231-a400-6f5555472404/what_books_are_in_bob_books_set_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce9d48c-7617-4dfc-a0d4-9651ed2ed957/60530038910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a810b774-5903-4504-842d-7b33ad43aaf8/levenes_test_of_equality_of_error_variances_violated.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_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 5324 bytes
SHA-256: 11951d2e1bb6c73050ff6887a2eade5513d36b7c760688dd73ef37b6cc19db31
font_01_sfnt_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 10588 bytes
SHA-256: 02fa7619008baeba289e3d6486c85dbd696d3e34c541853936edbbb2aa4c23e2

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