Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba91963d01440b6…

MALICIOUS

PDF

79.8 KB Created: 2021-03-23 06:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f6efd430fafe3bfe2cf2fc4f7e7e860a SHA-1: c41b985c22490ba63d7a2d22e60ab0a9f624f663 SHA-256: 6ba91963d01440b6502f307ba53fac15f11158f00ee1d85f681e04f10e23b3fe
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 0.9990

Heuristics 6

  • 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 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://seumenha.ru/strik?utm_term=unbearable+lightness+of+being+movie+trailer PDF link annotation
    • http://limelusefi.iblogger.org/metal_gear_solid_5_phantom_pain_review_ign.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/can_i_keep_my_dead_dog_overnight.pdfIn PDF document text
    • http://xozivupanivos.22web.org/forming_cement_stairs.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/adobe_reader_apkmirror.pdfIn PDF document text
    • http://ganivobuka.iblogger.org/papilles_caliciformes_gonfles.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/8ad6294e-1223-47be-974f-024772b88483/95072358504.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/gilirifiwol.pdfIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_e5064038098f4cccb3eaf17025f22dc6.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_56cb5bab37884924af822a94d2490b19.pdf?index=trueIn PDF document text
    • http://vomepixoj.rf.gd/sheet_metal_forming_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a56c043-8b6a-4149-aaae-6f324e9cfb12/peter_senge_fifth_discipline_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92dcd49-57d8-4b14-96d2-7dcd6f1ccc1c/practical_business_math_procedures_13th_edition_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d848df30-46ff-4cae-8906-35aaece2dd41/how_does_text_messaging_affect_writing.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_80e179be27d240b3a955b90d38f384bd.pdf?index=trueIn PDF document text
    • http://dafukip.myartsonline.com/zaser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdc9de3-01d5-46d8-88a7-046f36b3a5e5/bekisesunuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/gevumazerigapurovajanita.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_5f44bbc5b26848e19d62cd478dbe8447.pdf?index=trueIn PDF document text
    • http://visunes.myartsonline.com/54591172092.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_5cedf4e049a04113a9432a75143bf429.pdf?index=trueIn PDF document text
    • http://zujakogi.onlinewebshop.net/awareness_of_dengue.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_c3d4f4aa94be419cb890695ae21268c0.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_8500d879fceb4289b2b400f15222294f.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_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 5372 bytes
SHA-256: ead3f16035f4a8886fdfd2e7984603e0725032b17803a15ba341183905237a16
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 11652 bytes
SHA-256: 392118660471aeea7e7ca7fdec2197a7e6a5c5026f787da7af8e457170a72494