Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9ba20be75a6b98…

MALICIOUS

PDF

103.4 KB Created: 2021-05-07 19:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8f8a5c4c181510360cf984894fc664dd SHA-1: 267e8fb00685d077bd1589546eae3efea5cfec27 SHA-256: 0f9ba20be75a6b98dcebf20561a15f2d48527110f01a2515411a8ceb2501df60
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=simcity+4+deluxe+tips+and+tricks PDF link annotation
    • http://covid-19online.site/93507150470kbbv3.pdfIn PDF document text
    • https://cdn.sqhk.co/rosubeno/Bhj4ZZ7/hungry_birds_restaurant.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/Yjb4Ttc/battlenet_launcher_eu.pdfIn PDF document text
    • http://shopbest.online/dsc_add_user_codesak1tp.pdfIn PDF document text
    • http://bigchance.pw/tascam_424_mkii_manual2694w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_5fe8a500c92f8.pdfIn PDF document text
    • https://cdn.sqhk.co/moxasapiwer/uohiAhh/vijuj.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/nupofufibolibavajuwus.pdfIn PDF document text
    • http://hookup153.fun/pevopujasuruziwevn7ghm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494681/normal_5ff8c96194269.pdfIn PDF document text
    • http://voyazh-shina.com/wipaxenituvotikazdwxx9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_600abfb8e1774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_605ff16d861c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474450/normal_605805e100cbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_604d20cadffd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_605a996f9e9a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japinoxizidunub.myartsonline.com/lg_washing_machine_top_load_user_manual.pdfIn PDF document text
    • http://xufolat.atwebpages.com/20410480945.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_off0001549a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549A 5644 bytes
SHA-256: e6e6e369dad5572d1144e8c80f70a78e75e73794fa01d815e02ed4f405933313
font_01_sfnt_off000167d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D3 11716 bytes
SHA-256: 6d3ffc2aa7b93a79379b5541e068b78942c89caa01424f2068e2ed529ae2af62

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