Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d331003583a93d…

MALICIOUS

PDF

113.1 KB Created: 2021-03-12 15:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 56e07b6e1ea48235a2c4ffbd2bdaa704 SHA-1: 9ca34e59956e05eab5620b8cce205a49ec2bde4d SHA-256: a0d331003583a93dafc53e821feb33705893aae210cac6f875f52c2e1d21d8f3
186 Risk Score

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 0.9994

Heuristics 6

  • 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 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/award?keyword=all+engineering+drawing+symbols+pdf PDF link annotation
    • https://cdn.sqhk.co/gojinuma/gdgjhii/total_conquest_java_game_cheat_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/eqjg8jd/global_warming_solutions_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/idjgT46/how_to_slice_shapes_in_cricut_design_space.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/dZgj8jb/82563809791.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/ed35db3f-cf61-4f39-a997-2b6604db328a/81607859795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f534b2aa-d1dc-4ce3-a6e8-bd32eafb79ea/kewevawuwoberavo.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/math_teacher_s_guide_grade_10.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_de7db09312dc4bf3a5834bc2d186d5e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/773d78b1-b0d5-4c35-9acd-38ee213900be/what_do_i_need_to_make_my_uppababy_vista_a_double.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c741e912-a877-49ac-900b-9eb1f872d706/what_type_of_government_system_does_russia_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a9ca7f-5643-4bf1-a924-1d2535e0d1da/32546286323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780cb52b-19f0-4e80-b593-36cc66b264d5/why_is_tort_law_important.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_77668c67fbad40afa42a137729e50dfb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d413ef-e1d2-4bc8-8204-ca485d1f496d/bumikikugolisado.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_c9f799dccb1c40739c4ed4900933d2d2.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_9cbc5324092b474496856c950a92f73b.pdf?index=trueIn PDF document text
    • http://rizivubonulej.atwebpages.com/xigediwaviwekewalez.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_92edf0fbf64440dea6031bc9695aa06a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc220a9b-739a-418e-8fd9-c680aa96e0cc/maruburitigemujikajugur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce03f026-7eca-4947-86e1-e98feeaf096a/14741890972.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_23032e8ce5604a0a98a773da89f5da7d.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_07315370fde94ff081bf25924187ae7b.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
    • 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_off000169b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169B3 5684 bytes
SHA-256: 99e027e20940805869fad82e8bb9acc5a5d50ed5b6a69a13aad28505871c442b
font_01_sfnt_off00017d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D0C 10372 bytes
SHA-256: 3be736dfafbc9a8bad87409c987ed56c07679161af216029e6c9a5606a68815a
font_02_sfnt_off0001a0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0CC 16320 bytes
SHA-256: c594c6b6fb28ae30df22654094f14f0059d120794fec8978204ce64b4acb14bc