Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ded2b9d11a6800…

MALICIOUS

PDF

61.6 KB Created: 2020-11-10 13:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2a2772fcc272c407573cdd09024a3099 SHA-1: 15ae16fd41f99c023ffaedfc8bd16305c4e7f1b7 SHA-256: 17ded2b9d11a680015907bdeb077c97f8349e62282acc320e0cdac4960d9a69f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://trafffe.ru/strik?keyword=fondos+cristianos+gratis PDF link annotation
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/xokutevifekuloxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5f88c60fe37c7.pdfIn PDF document text
    • https://zewosesivate.weebly.com/uploads/1/3/4/5/134591998/samawapo.pdfIn PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/875a321ad.pdfIn PDF document text
    • https://kogemamol.weebly.com/uploads/1/3/4/4/134487898/mimamurex_gafopineto_vojelov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_5f9946e494981.pdfIn PDF document text
    • https://fudegenajeno.weebly.com/uploads/1/3/4/5/134581691/20dec064.pdfIn PDF document text
    • https://laxigozi.weebly.com/uploads/1/3/4/3/134361341/gimuginetobamedegibu.pdfIn PDF document text
    • https://sotodivejezaze.weebly.com/uploads/1/3/4/3/134391575/d985509b.pdfIn PDF document text
    • https://bevatisaxotel.weebly.com/uploads/1/3/4/3/134378436/3598157.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/678a2b171.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/vadirabuneg_senusefozotuzak_kizibuteniniw.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/af0eba01-f687-47d5-9ea6-730109e152a3/57563140782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a61645e-8ea4-4952-9cdb-1f809888ba98/continental_math_league_2019_results.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d52f85-130b-4b0b-bca0-12f8a99ecf59/how_to_collect_visitor_recording_in_fortnite.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_off0000b4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BE 5032 bytes
SHA-256: 56d681084dfd76b3c98903aec429df5feecfbe7d2469541b44396a19105a7ee0
font_01_sfnt_off0000c5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 11140 bytes
SHA-256: fa9e98c1912e2de451d1a66bc9efa02f62f67b0c08300abe04f1fb46562714ec

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