Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75eda99bfeb4cff…

MALICIOUS

PDF

77.3 KB Created: 2021-03-12 19:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 26b4355702062994de504e39856af3c8 SHA-1: 0421866bd48b18828ba01701326cc8c228a0c43e SHA-256: a75eda99bfeb4cffa89c15f390c32e47d198fe7cef9f44ec66414714c2760ede
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=battle+cats+cheats+iphone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412902/normal_5ff1b5be688b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446030/normal_6049ab0453ffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_6018e337d1ae0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390996/normal_5fe55fcdbb725.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/how_to_use_tidal_on_serato_dj_lite.pdfIn PDF document text
    • http://mattelipsticks.site/catfishing_meaning_in_tamilk84ua.pdfIn PDF document text
    • http://fb-copyright-help-from.com/vanobedexepedaxegupefewtj3o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_603859b7b05e5.pdfIn PDF document text
    • http://sallehq.xyz/57694728230invsl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5fe4e40f8086f.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/vosaxizofixutelatedonoymwvd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424646/normal_600395e5787c2.pdfIn PDF document text
    • http://souve.me/96511762191vn32s.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/75969515996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_5fdad6fd64abe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lijowavatajo.myartsonline.com/stewart_early_transcendentals.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_56f8d44f2ff1484ab02a03fc0ce442b6.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_0ac6fc4612324e21b2bcd7425e2a2678.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_81c2abf132f24153a5fd9de7fb0bfd07.pdf?index=trueIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_e3cb2582c50e4db9a28490e8187e23a9.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_b3ed8ac80c424d6aa8179c8a92d8df52.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 4764 bytes
SHA-256: b189d66c6009453a79212e3064ca47c5ad9942f64f358ae594d284dc11fd6995
font_01_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 10020 bytes
SHA-256: 264571ada49976fdaf11220592ef3d68eccbabc18de98c8b6ff8f687ce594058
font_02_sfnt_off000119e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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