Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1dce015c7cf86a…

MALICIOUS

PDF

74.6 KB Created: 2021-02-21 13:20:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2541e9d80883064f0ef305893e1f3ea SHA-1: 349f48ad1015d1ead325d943564d2003df97b122 SHA-256: 8e1dce015c7cf86a3ce29604885312941fa44751dacf6058ff276bfe1486812e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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://leonvi.ru/wix?keyword=grass+carl+sandburg+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461767/normal_602afb02cb826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_601e261f32d52.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hg3edge/bull_rush_combat_maneuver.pdfIn PDF document text
    • http://jazulivorif.iblogger.org/vuzusupojowatug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369904/normal_5ff5c50246043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5ff509369eab3.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/icTibii/63859731027.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/museligasazokun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5fd226fbea369.pdfIn PDF document text
    • https://bilagezapa.weebly.com/uploads/1/3/1/1/131163658/mewodu_sunozoliketowi.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/hgT2icq/gangster_crime_simulator_mod_apk_android_1.pdfIn PDF document text
    • https://lodobapidadisu.weebly.com/uploads/1/3/1/1/131164557/3696263.pdfIn PDF document text
    • https://fopilifufisi.weebly.com/uploads/1/3/6/0/136055159/pefudo.pdfIn PDF document text
    • https://laganavixafalos.weebly.com/uploads/1/3/5/3/135341912/3617239.pdfIn PDF document text
    • http://gikadoketu.iblogger.org/convert_crt_to_pem_format_openssl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wofaketizezoja.epizy.com/53961052356.pdfIn PDF document text
    • http://zozemuki.rf.gd/29207231199.pdfIn PDF document text
    • http://tolimimagag.epizy.com/eular_gout_guidelines_2017.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_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 5532 bytes
SHA-256: b4de55a9d8fcf45a9360997290b0f78e0cf63c488b2e1cb98b1ce4f3592563ed
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 10392 bytes
SHA-256: 016be2b1f6ab6b650f46ce6c658b719ba49d8e07e5481cbdd1681ec7b5146558

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