Malicious PDF — malware analysis report

Static analysis result for SHA-256 9715dff9bc9e53b8…

MALICIOUS

PDF

86.1 KB Created: 2021-03-18 05:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd3e0899ede763c761eadbed5034452b SHA-1: 7f485a1f54a73d4cebc90a86845d8b1f36b2ae6e SHA-256: 9715dff9bc9e53b88b7925974681797211bda96cb5e16e12fa4a9d8b15c46f85
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO farms or phishing campaigns. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external links suggests an attempt to redirect the user to malicious websites, potentially for credential harvesting 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://druttle.ru/wix?keyword=uvt+2020+que+es
    • http://tebapewulodafe.getenjoyment.net/jivubidokudiwosug.pdf
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5ff15344939a3.pdf
    • https://cdn-cms.f-static.net/uploads/4424036/normal_60401eff46a1f.pdf
    • https://static.s123-cdn-static.com/uploads/4420020/normal_60074ff4c0ae6.pdf
    • https://static.s123-cdn-static.com/uploads/4480594/normal_600979848260e.pdf
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fd046f3e60b4.pdf
    • https://cdn-cms.f-static.net/uploads/4454289/normal_5fe8b9a8d7fac.pdf
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/97cc8e.pdf
    • https://cdn-cms.f-static.net/uploads/4457582/normal_60142fe90a752.pdf
    • http://xepidenad.scienceontheweb.net/60664251383.pdf
    • https://cdn-cms.f-static.net/uploads/4458616/normal_603fbad61c0c3.pdf
    • https://padabomax.weebly.com/uploads/1/3/4/6/134681696/rogak_weteluz.pdf
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/guwazas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jujadodedaruxix/nuvomidoxeva.pdf
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_e404645265794ca5a019a563227bcf27.pdf?index=true
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_c18f601eb5c141d4a6439fcb13aa4a20.pdf?index=true
    • https://s3.amazonaws.com/povodijirig/tubada.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010406.bin
48acee6ba4f39fefe4eec76af8f58fbea85b67593dbfe3fa3f4b9b8039072933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 4408 bytes
font_01_sfnt_off00011317.bin
ffa5e80334192abc267768a730f5364290f5456e8434e26f6168325efdcb2f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 12748 bytes
font_02_sfnt_off00013c5b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 4324 bytes

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