Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0b92140715b179…

MALICIOUS

PDF

80.4 KB Created: 2021-04-04 18:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 478d33175f241546f72e572115d7b795 SHA-1: ce93ed1262883b54f005de5beb2c281d0cc529c5 SHA-256: 4c0b92140715b179519f014d28d607deddbd0e45111b4e9619c4f24775bb8e2f
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://ponafet.ru/strik?utm_term=first+90+days+of+employment PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5feda349d92e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413696/normal_5ff2316b3e101.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/gcjeR1G/mlb_network_games_on_tv_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5fe98e2c667dc.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/khdicib/41057072637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_601b4971e4f53.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/wHiezHi/4_pics_1_word_5_letters_cards_money.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/ajbkEhj/stick_fight_the_game_mobile_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/Zjdjhhh/fapezuwuzelat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475209/normal_600414c199f4c.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/Vtxgdjt/acofp_inservice_exam_2018.pdfIn PDF document text
    • http://zinepifulew.22web.org/desktop_calendar_design_vector_free.pdfIn PDF document text
    • http://latatal.iblogger.org/79547112953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458625/normal_5fe1ea425e3fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5fe82c617e251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_6002754d872be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixefafezas.rf.gd/30067273873.pdfIn PDF document text
    • http://nozoxofepek.rf.gd/12998801032.pdfIn PDF document text
    • http://nolerepegumadoz.epizy.com/timoxovomezuxibiw.pdfIn PDF document text
    • http://damatagowigiz.epizy.com/is_metroid_coming_to_switch.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_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 5540 bytes
SHA-256: 2c6e54caa0f82031475e2b32d350c20194de533be95efcf2fd07141acd0fbb0d
font_01_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 10752 bytes
SHA-256: 6d9a5bd2aa400ed543699ab5405c57cddef57f2d4821371550fc16501c9663a8

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