Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ce7bd7722396f0…

MALICIOUS

PDF

81.4 KB Created: 2021-03-20 17:26:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f9f66dc8a15e702db48f97fe14975c1 SHA-1: 2e2bea6b8c2f0a58795d74fba512e772bf4d0de2 SHA-256: 68ce7bd7722396f00f220f151f441d642d3d97bbf4fd6360378b90cfb27612be
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with one URL pointing to 'unblocked 1000 free games to play'. This suggests a tactic to manipulate search engine results or direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=unblocked+1000+free+games+to+play
    • https://sufusaripowo.weebly.com/uploads/1/3/1/4/131437865/927679.pdf
    • https://cdn-cms.f-static.net/uploads/4408335/normal_60503f6542f23.pdf
    • https://cdn-cms.f-static.net/uploads/4479441/normal_60261d3a512f9.pdf
    • http://apelsins.space/didevekioib9j.pdf
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/ramukuriz.pdf
    • https://radufogerexe.weebly.com/uploads/1/3/4/2/134265868/242ae4e188.pdf
    • https://static.s123-cdn-static.com/uploads/4450635/normal_5fe5a7cc24f48.pdf
    • https://jepexilopenokaf.weebly.com/uploads/1/3/2/6/132680937/9752194.pdf
    • https://dozisinabi.weebly.com/uploads/1/3/4/6/134646642/reroguneto-gowisewovubul-davanowa-xebezud.pdf
    • https://walabawasuris.weebly.com/uploads/1/3/4/2/134265347/8602244.pdf
    • https://dafelubuvotaxid.weebly.com/uploads/1/3/4/7/134753950/gufaxoxodubafat_gatufunitav.pdf
    • https://bevufifebuseve.weebly.com/uploads/1/3/1/8/131855995/6f50bf533.pdf
    • https://cdn-cms.f-static.net/uploads/4372707/normal_6052f6c84bce8.pdf
    • https://terogoke.weebly.com/uploads/1/3/4/5/134587715/bc797f46cff8.pdf
    • http://7lessons.site/depression_in_palliative_care_nice_guidelinesevsu5.pdf
    • https://cdn-cms.f-static.net/uploads/4453553/normal_6016c1017b589.pdf
    • https://dimulawi.weebly.com/uploads/1/3/4/3/134380670/zutefom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_dbc22ea4d2d34314854c2ee732c3caf9.pdf?index=true
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_0584f20438c64e98a235cddee20e6899.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd0.bin
0d62b07f37fa69962876ba612f4e7a7e72ef8833a6783da1ed007ea87697caaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 5964 bytes
font_01_sfnt_off00011016.bin
675f3869b650c7b8b8ecdd033cf4f2bc852e1b34810729ddbb03aafe145cd530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 11268 bytes

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