Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf904235bba1a09…

MALICIOUS

PDF

95.6 KB Created: 2021-04-03 15:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 334778f83e71650470de3a179304840d SHA-1: fab8fa682c9f74c110e64b08a715466d21c15197 SHA-256: bcf904235bba1a09c11c31823373b2d7ff697d9ee6308c64974901eedacd1fd9
126 Risk Score

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://bologen.ru/123?utm_term=desolace+leveling+guide+horde PDF link annotation
    • http://rocketdocs.us/flix_movies_round_rocksy06w.pdfIn PDF document text
    • http://ilkertr.shop/38426323034ihblj.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/hEOB8ih/my_android_phone_won_t_turn_off.pdfIn PDF document text
    • https://vazexisosumufil.weebly.com/uploads/1/3/4/4/134465451/bigekawakoka_xagofa_midivafi_fonaniletikipu.pdfIn PDF document text
    • https://cdn.sqhk.co/wuladupuzo/oEgy94m/yuri_alexandrovitch_bezmenov.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/ziwajago.pdfIn PDF document text
    • http://opensucre.pro/kawolodoruzamaxesagekenpnoqi.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/64237406818.pdfIn PDF document text
    • https://wavafawiwex.weebly.com/uploads/1/3/2/8/132815000/soxositurunexulewaju.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/DVkjfsE/56388350176.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/5Did53F/ecommerce_template_bootstrap_asp._net.pdfIn PDF document text
    • http://xitimudajejo.mywebcommunity.org/enlaces_quimicos_y_sus_tipos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mobevawawe.rf.gd/31707169.pdfIn PDF document text
    • http://kitabuzulex.epizy.com/war_horse_book_chapter_11.pdfIn PDF document text
    • http://mosetewugalivu.epizy.com/730616248.pdfIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_ad26a7c6868d4cdb9daeb8cff5f007eb.pdf?index=trueIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/vavibixap.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/lilinaz.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_014cc9d493244727b91e3e8e670796cd.pdf?index=trueIn PDF document text
    • http://vomonulesew.rf.gd/imperative_verbs_list.pdfIn PDF document text
    • https://78f121e6-5824-477f-9480-4bf23eba804c.filesusr.com/ugd/9564ad_45e2e1b89d7d41448274c77089676f11.pdf?index=trueIn 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_off00013b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1B 5260 bytes
SHA-256: f79c1297f9a14a5c6ec0fff21f342b398ea786caae335b7fc10c2d9d9cdf9867
font_01_sfnt_off00014d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D00 10528 bytes
SHA-256: 6c2afe73f60c1495871f4764144944093a54dd57c5eea2a188305855702fcce9

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