Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bd9f111c1147a1…

MALICIOUS

PDF

79.6 KB Created: 2021-02-11 04:35:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 18d4a0e76b9e465a1aa2b3f9b59a25e5 SHA-1: c77a60328f7809fe0aa09c73ef6ca72d30806693 SHA-256: 02bd9f111c1147a1f5c3e03ee4e530d83eb95f485e331dba67bdb7a9d414bb76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. It embeds numerous URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism to deliver malicious content. The document body, though heavily obfuscated, contains strings related to 'Nips 2020 competition track' and authoring application details, which are likely lures to disguise the malicious nature of the PDF.

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://jottigo.ru/123?utm_term=nips+2020+competition+track PDF link annotation
    • http://driveformclanemilwaukee.com/cosmote_4g_wifi_router_manualcuida.pdfIn PDF document text
    • http://tizezs.xyz/yeni_trk_edebiyatd2drp.pdfIn PDF document text
    • http://nashremont.site/sawuxumukukumeruwedeto0u46b.pdfIn PDF document text
    • http://pedron.fun/88355588157x4hjb.pdfIn PDF document text
    • http://depotupunejiwo.iblogger.org/fortnite_forged_in_slurp_challenges_cheat_sheet.pdfIn PDF document text
    • http://classkaod.ru/spread_offense_playbook_basketballsvrit.pdfIn PDF document text
    • http://goloszauniver.fun/leap_of_faith_water_slide_slow_motionddaao.pdfIn PDF document text
    • http://wildboost.club/mariadb_system_versioned_tables_performance1h8al.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_600aefcf6cea0.pdfIn PDF document text
    • http://montana-media.com/symbolab_pro_apk_2019566cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5ff7727e0f456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5ff88236f3845.pdfIn PDF document text
    • http://iranomics.com/manual_de_chery_tiggo_20154a7mb.pdfIn PDF document text
    • http://tuzazigigub.iblogger.org/washing_stained_white_sheets.pdfIn PDF document text
    • http://mobevusujezuno.22web.org/lewoduduvagisorifuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5fd3d4c4a02bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://podugidak.epizy.com/76737829764.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_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 5352 bytes
SHA-256: 6864e4832fb399992b4d3e0fcf35a8f5032b0c5a21d67925b05594282ac0f52e
font_01_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 11816 bytes
SHA-256: 431f48fa55b31477fd5f300a81ca0a777f7771b3a2f61fd7da2d9f7c8bd923ac

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