Malicious PDF — malware analysis report

Static analysis result for SHA-256 49739d96c24cf6c2…

MALICIOUS

PDF

74.5 KB Created: 2021-03-28 08:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 321d7b21f8e149e4f60535c8f9b1c526 SHA-1: 641984a8d4103d5c3ec94bb3d249540eaae066a7 SHA-256: 49739d96c24cf6c2fe494705cbfcb704d4bbc03fb2e901a1ceec661e089fa130
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=acca+f3+paper+pdf PDF link annotation
    • http://kudretbozaci.com/4541424628ug5us.pdfIn PDF document text
    • http://gasolotiravizid.sportsontheweb.net/candide_voltaire_deutsch.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/what_is_the_catholic_definition_of_marriage.pdfIn PDF document text
    • http://myirn.icu/head_horse_horror_game_note9pwaz.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/the_artilleryman_s_vision.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/livabadovisanabi.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/31695457209kvu2y.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/margin_of_safety_mechanical_engineering.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/wokikafamajilaz.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://zabolojisag.getenjoyment.net/19115217864.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/xotomisen/putanogasa.pdfIn PDF document text
    • http://taroveruwidiba.onlinewebshop.net/business_in_nigeria.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_a9b682856c0140618e84f6e22a401c42.pdf?index=trueIn PDF document text
    • http://zilisidojaze.myartsonline.com/debatumimebadugamijonezas.pdfIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_158c4091c2ba4d75ae635160fd4841ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f5dbc48-bd01-4cbc-ac6d-a2d00a517ae6/zupuribudi.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/liftmaster_security_plus_2.0_universal_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/how_to_tell_if_dryer_thermostat_is_bad.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_cc43aea2f0a84dc48ac32ada46c5982d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b31105-8758-4c76-99d7-1591d6c77994/alaska_drivers_manual_flashcards.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_01206f84231b41a88a205ba57a169ed9.pdf?index=trueIn 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_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 5092 bytes
SHA-256: f61067df99988d66f288595a9442378351c0f5d5fc84138a89cb4c1caa1abba5
font_01_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 11584 bytes
SHA-256: 61e475cf7818a233b3f51b7a4a954882ab6a087584d6288150352f18652426b3

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