Malicious PDF — malware analysis report

Static analysis result for SHA-256 7618e398bf3c9a1f…

MALICIOUS

PDF

109.1 KB Created: 2021-03-19 20:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57fcd279afa304e26ffe1df7e3b2fa28 SHA-1: 12247607eccce9dce8b2b098418062618c20cb0e SHA-256: 7618e398bf3c9a1f2ad0b0ea433637eafeb7733dfe5a83fa7b555d6e3f346bb0
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 0.9997

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://dugedepap.ru/strik?utm_term=what+does+hieroglyphic+mean+in+us+history PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488809/normal_5fe8fc7b07ba0.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/simple_python_programming_questions_for_interview.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_602e372db44d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5fe517b270d51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_6047c0fa0e5ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495558/normal_5ff653e12261c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/42177691560.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_b8abf675240f4376bb411e94ca87851d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b113ef44-6c9c-4ecf-b2da-809b43df8847/69887749456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7aa9dad-ac53-4ad6-b7fd-5740abbb7d26/memuxubozokepaxokepemu.pdfIn PDF document text
    • http://dojiseb.epizy.com/bose_s1_pro_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/erik_satie_gymnopedie_sheet_music_free.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_5e2f26cbeb464875bc10c38b35e592d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0488dc-4c9f-4221-bb20-7e8e3742e583/redefazat.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/turn_off_advertising_id_android.pdfIn PDF document text
    • http://towupew.epizy.com/gokarifanixomojufesevajo.pdfIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_bfb686bf8a5a44b3ab7fd790a5fe61dd.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_2fc27818d2c84eb9904d431a7a05af40.pdf?index=trueIn PDF document text
    • http://vapoborino.rf.gd/is_a_2008_gmc_envoy_a_good_car.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_4d412112d3b641b69a5620978f3f6440.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_off00014b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9F 5600 bytes
SHA-256: 88b2ef92d468db4fc8c46e1ca3e2fb5d26666ce96a7aa6c9fa5aa1f98b413f43
font_01_sfnt_off00015e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E95 16832 bytes
SHA-256: 0522390ea9d56228732dd60de1e49642f90ad997bd7787aecaf75b69bd0a65f4
font_02_sfnt_off00019105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19105 16244 bytes
SHA-256: 65c462a500e5bae42a7fe157060c26c87836613a50d484fc1d6cb3cebb662235

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