Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fd521527c044ba…

MALICIOUS

PDF

113.1 KB Created: 2021-03-13 15:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 65b1d94aecb5f703e021aeac8bf1fcaf SHA-1: 2ece04dcec82f0f6f03ae0270e98b7840baea0da SHA-256: b8fd521527c044ba9f7f2ad6c9bba82d23b7c7e0523f7c32a0d83f8797c3e301
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which points to a site offering 'sniper 3d assassin mod apk unlimited diamond', suggesting a lure for potentially unwanted or malicious software downloads. The presence of external URIs and the nature of the embedded content indicate an attempt to redirect users to external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://botokaw.ru/wix?keyword=sniper+3d+assassin+mod+apk+unlimited+diamond PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450730/normal_5fc8fb9a064da.pdfIn PDF document text
    • https://cdn.sqhk.co/mezewimaxus/ZiiMb1C/6160423843.pdfIn PDF document text
    • http://tupuwuwegidava.22web.org/45056854485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482880/normal_602264cfe714f.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzojivemepe/hgVWfib/guideone_specialty_mutual_insurance_company.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/gcj0Hid/tall_girl_chat_up_lines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478141/normal_6009a99348c36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5fe07c23b8fcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471095/normal_6019f466f077f.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuloka/FMtpicr/30055026946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_6010d68b3ace5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_60214046375f2.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/ricgGio/dexer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386822/normal_5fffbe7dc5814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_ee01b13ae7164928b9125ebaedb07044.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_aa06b518946a4e6ea2e63b81d9418d56.pdf?index=trueIn PDF document text
    • http://xugowosapiri.rf.gd/mufade.pdfIn PDF document text
    • http://vaterojot.epizy.com/antidiabetic_drugs_chart.pdfIn PDF document text
    • http://fipemezil.epizy.com/wosekanatekiwejurazom.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_d77031d68de44d75baa058a162badc38.pdf?index=trueIn PDF document text
    • http://magapupegijovot.epizy.com/short_summary_of_treasure_island.pdfIn PDF document text
    • http://zumibuxukoforen.rf.gd/caracteristicas_economicas_del_modo_de_produccion_feudal.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_c8058b42dba74d8099d87c5c839aba43.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017ee9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17EE9 29320 bytes
SHA-256: ccb1a76106ddf74de3fe37619a8fbbf8853ab4446bb67d235e09d51255a57a88
font_00_sfnt_off00014330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14330 5436 bytes
SHA-256: edb6fce03e1f36657796b060a7f1707105bf27cb1b82212656228ce0fdd75215
font_01_sfnt_off00015595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15595 12060 bytes
SHA-256: 90c1ea8ce22113bf8f7aaa02c99f2d9cb7875e2c07012895e57795f4e6e20b73