Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca41fff14789df8…

MALICIOUS

PDF

73.4 KB Created: 2021-02-28 06:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 45702cc2be4e9dcf9d76ddd785bdb326 SHA-1: 9642620f1ec9fd2883c3470e759ebb41682fee79 SHA-256: aca41fff14789df81abf84f58b6caafe7a8ef659de4d3b87cea7dead0e119a54
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=bar+training+course+uwe PDF link annotation
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/6116433.pdfIn PDF document text
    • https://zolulosix.weebly.com/uploads/1/3/3/9/133986826/84b37f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5ff8c4cdf0d82.pdfIn PDF document text
    • http://masterpowerpoint.com/wubalugujoginokamd42ka.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/bidexudixog.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/what_are_good_interview_questions_to_ask_interviewee.pdfIn PDF document text
    • http://inscarusa.info/fokufedaxizugimctyw8.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/CgijgkN/11211158845.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/world_map_blank_outline.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/84530434586.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/gajomitoranufamiki.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/what_is_the_average_operations_manager_salary.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/lipopezenigij-fisabide-pagiwemik-zejujisefof.pdfIn PDF document text
    • http://tiktokhd.design/hoja_de_balance_de_comprobacionpb742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_60207c115950d.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/c0aedbb74.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/menijipujamogineboxadub1lxvk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 5076 bytes
SHA-256: fa341532521325f2f299d9c04680133ec784f24b194e0755dea68cf89396eb65
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10772 bytes
SHA-256: 22a06300d33a2f72114e6ffe86ab478e8594a3a1c4d9b18dd3e06d4697e50d5c

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