Malicious PDF — malware analysis report

Static analysis result for SHA-256 083efd1fe6ff9fed…

MALICIOUS

PDF

83.3 KB Created: 2021-03-28 02:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7c9d115bc8fbe92c112c7d1abeac734e SHA-1: 1075b62b057f647373ec1897a5f239fe0d0644a5 SHA-256: 083efd1fe6ff9fed77f830e00d1a41cf5ff97a532d7a17c1b96cf21eeff15b92
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, likely to obscure the final malicious destination.

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://druttle.ru/123?utm_term=docker+software+free PDF link annotation
    • https://cdn.sqhk.co/nixafusoda/ai5ibzi/airplane_flight_pilot_simulator.pdfIn PDF document text
    • http://notdull-eng.online/450941620319nm27.pdfIn PDF document text
    • http://fudazozotakaxal.mywebcommunity.org/what_are_the_similarities_between_the_three_colonial_regions.pdfIn PDF document text
    • http://repair-telefonov.ru/dramatic_irony_in_to_kill_a_mockingbirdkfhy9.pdfIn PDF document text
    • https://todumubisopid.weebly.com/uploads/1/3/5/3/135312552/7567452.pdfIn PDF document text
    • http://perfectiona.online/36557202416q5wfz.pdfIn PDF document text
    • https://girewatadetax.weebly.com/uploads/1/3/2/6/132681062/zetanenuxede-musevu-butus.pdfIn PDF document text
    • http://testrun.ru/oxford_discover_3_vkynuqi.pdfIn PDF document text
    • https://cdn.sqhk.co/mogidamiko/5ifqgde/tribalism_in_africa.pdfIn PDF document text
    • http://leaninrzpd.site/how_much_is_la_fitness_monthlykx77n.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/fovoboxefa.pdfIn PDF document text
    • https://ribuborufexegax.weebly.com/uploads/1/3/4/5/134507127/68c13b0.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/hfhjibK/cfop_oll_algs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefedajuwefafi.rf.gd/39182887170.pdfIn PDF document text
    • http://fapiruligifujo.epizy.com/6th_grade_math_olympiad_problems.pdfIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_b946ec2cc912401f9ae7ce7d15554e44.pdf?index=trueIn PDF document text
    • http://vugapadilubokis.epizy.com/colorectal_cancer_surveillance_guidelines_2017.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/rival_ice_cream_maker_walmart.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_bc1fdb9b7b8847a69a473212b85fe577.pdf?index=trueIn PDF document text
    • http://pozijawikubinun.myartsonline.com/fonobibejomevuxaxemupume.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 4996 bytes
SHA-256: 5c9e268e8fadcace26ee0dcb7febb42fa9a543cc7ee2a63f8a7bfe882eb4439d
font_01_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 11648 bytes
SHA-256: 22363c73093184113fc2aa74dc99789d3c54a3a36055ee0de1f0340b185a749c
font_02_sfnt_off000129cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CC 16600 bytes
SHA-256: 6b250e9eb97d1d91dad305522aee314b12feb4a0e2a1b67b58b51a2cc4349662

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