Malicious PDF — malware analysis report

Static analysis result for SHA-256 baed8d06472ba2e0…

MALICIOUS

PDF

76.8 KB Created: 2021-04-07 22:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d94d13f62c476a22be884f51fe4fc96c SHA-1: 5b52f7d2a54f1eb03c345a8789eddf0fa45641b8 SHA-256: baed8d06472ba2e046018be8d6e160ddb5d3e4ea3615d1709be6f4c0f90f2344
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=hard+reset+kyocera+e6560c PDF link annotation
    • https://cdn.sqhk.co/negixakozaxu/j1jvihp/amazing_facts_in_the_world.pdfIn PDF document text
    • http://bodegumuxizobi.22web.org/enlightened_journey_osrs_quick_guide.pdfIn PDF document text
    • http://lorenbayi.com/kezorapinuwukexovel4zfe.pdfIn PDF document text
    • http://sethel.xyz/86402258040cz840.pdfIn PDF document text
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/ribogafibakedusi.pdfIn PDF document text
    • http://susadaxaxavotij.22web.org/8th_grade_math_review_worksheets.pdfIn PDF document text
    • http://fonozuzaj.iblogger.org/how_to_turn_on_wii_u_gamepad.pdfIn PDF document text
    • https://fefizilev.weebly.com/uploads/1/3/1/4/131453506/15fca6a8bf.pdfIn PDF document text
    • http://gifebadop.iblogger.org/materi_kuliah_amdal.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/gfjdkji/7514263599.pdfIn PDF document text
    • http://macsk.space/work_turnover_reportd5cpd.pdfIn PDF document text
    • https://berapozi.weebly.com/uploads/1/3/0/7/130776213/nodeza.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/lokekosejib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pixokux.rf.gd/color_coded_handbell_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a570de66-4999-4663-86de-2c8c831177f4/.pdfIn PDF document text
    • http://wixezujixib.epizy.com/99708960557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e3bf4d2-3dbb-4c7c-9bc3-732875d90bd3/why_is_the_alienist_not_on_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba05895b-5914-4e78-aead-c963f3092035/mars_is_heaven_by_ray_bradbury.pdfIn PDF document text
    • http://sebilazog.rf.gd/sql_server_dba_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b609a3-4e2a-41d6-a842-e0821f94ff8d/the_jane_austen_book_club_2007_trailer.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_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 5448 bytes
SHA-256: 93645642b82a0bd2945dcd69a0465e01ef65c7f166991fefed02ca03f3cb9610
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 11104 bytes
SHA-256: 4f2a8af4da151aea4e21f516d3285b37d3d83a615eb65a26cb753bba94cc32d5

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