Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4c85be9e5777cf…

MALICIOUS

PDF

94.7 KB Created: 2021-04-24 21:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 67e32bcf304cefba96452c8f357a1cfa SHA-1: aca816616b2a4b0f8c1dfe35683ef29e425297fe SHA-256: bd4c85be9e5777cf7c3b3e418e70fd7645d246d5893a6ffea316df09d927f0f7
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, with a primary suspicious URL pointing to a domain associated with link farming and potentially malicious redirects. The document body, though heavily obfuscated, appears to be a search query, suggesting a lure to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=what+is+meaning+of+computer+hardware+in+marathi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fcd3404bc97b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5ff86d4cefbf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_605ef6bac89fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471252/normal_5ff2bdb5680fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419820/normal_60500b4f4d696.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d6f7c6-cba0-420c-bfda-646ae5b9123f/43875608249.pdfIn PDF document text
    • http://wazuvolixevafo.rf.gd/99738597925.pdfIn PDF document text
    • http://vulomalizekuvu.rf.gd/7851535698.pdfIn PDF document text
    • http://nitamag.epizy.com/formal_business_letter_template.pdfIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_8928e1693b104059b2f6533330dcff95.pdf?index=trueIn PDF document text
    • http://vewawukeko.epizy.com/xefetazubujuxozasune.pdfIn PDF document text
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_18e6d3820583454cbed720e1319c08c9.pdf?index=trueIn PDF document text
    • http://najizomixa.rf.gd/weruzitivalagaluxufurok.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_596d8859711c46ef84609cc2cd080b15.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_f8dbc0e91fb042cc85e6307ae9000806.pdf?index=trueIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_a0c8006c3c3e46149602f3724da55f2d.pdf?index=trueIn PDF document text
    • http://kadegezopofog.rf.gd/buwoboroso.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_e90b390970d44cb3963d1cf2ccfb94b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f10c40-6065-4ed9-a079-ccaaae366fa2/ralet.pdfIn PDF document text
    • http://kogurowifa.epizy.com/basel_2_ting_vit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 5640 bytes
SHA-256: 54b11ebf7a15c195d3bde015c7187b1339bc4e0a4cbcd0a19d1d210c68d9397a
font_01_sfnt_off00012eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB7 11540 bytes
SHA-256: 8d73d884a2d39a577977cf570f623585c8c5973ef89067e3d47aff97960abb24
font_02_sfnt_off000155d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D1 5928 bytes
SHA-256: f7d50ae19d26e99689a018adf21636d66bfc9f1f01c4f60e6c9f4f8aae2af9bd