Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ee13f4e59cbec4…

MALICIOUS

PDF

71.9 KB Created: 2021-03-09 19:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 823f981ad197e356c8c22e1d76e0c08a SHA-1: 5811f01c7d82c1c0d43e59ee4030f6498e654aa1 SHA-256: c3ee13f4e59cbec4995f6bec94eff059d5725156ed7718172a74cdedf526f420
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 0.9998

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://vilenefex.ru/award?keyword=ca+vishal+bhattad+booster+pdf PDF link annotation
    • http://sofebitaxed.iblogger.org/pomudanokumulakuraxan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421462/normal_600b41d59207c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407102/normal_6003c43d756e1.pdfIn PDF document text
    • http://xujosigij.iblogger.org/android_app_in_chrome_installieren.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427538/normal_6008128d5e530.pdfIn PDF document text
    • https://cdn.sqhk.co/kamugututu/gcMTjgp/is_finneas_really_billie_eilish_brother.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/jcicSA8/facebook_portal_black_friday_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_6020fda29b384.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/ihbVgjQ/molox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_5fda46c4ca465.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/isPZ8KU/cinema_tycoon_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460247/normal_5fe23d758089a.pdfIn PDF document text
    • https://cdn.sqhk.co/xawesani/xGbiff6/the_war_for_the_west_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_b2ceb6b04afc47cbae6cc8d2a7e631a1.pdf?index=trueIn PDF document text
    • http://nobegik.rf.gd/titubalodobasolebexopej.pdfIn PDF document text
    • http://kokulokigebowow.rf.gd/accounting_cycle_free.pdfIn PDF document text
    • https://0c3ea459-8207-4ce1-908a-2248ca110ef2.filesusr.com/ugd/87b9a8_099cf2da73e8438fb7e04ba091842cac.pdf?index=trueIn PDF document text
    • http://luvewon.epizy.com/nelozamexowaron.pdfIn PDF document text
    • http://juzavinozil.epizy.com/canon_camera_connect_for_windows_free.pdfIn PDF document text
    • http://gemakeruw.epizy.com/best_reads_for_beginners.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 5232 bytes
SHA-256: 393f07fbc34c0b81051614c35a61aeae6cc6a1ee0b7123789e632d99342c07d7
font_01_sfnt_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 11184 bytes
SHA-256: 45275831aa4dad5a15c25c021e633be1ca460acbf413986dfe8433656228d965

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