Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5dd69511ff5796…

MALICIOUS

PDF

73.9 KB Created: 2021-03-20 20:18:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82d07b085dcece048e7172251ddacb79 SHA-1: 727bccdae2c021869f065d3f9c1c21517db8be71 SHA-256: 7d5dd69511ff57964b421a5aa399a638f0aa2d866e0a9a01f6c8e193d54b11e3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to 'jumiwimov.ru'. The file's metadata indicates it was generated by wkhtmltopdf, and ClamAV detection flags it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jumiwimov.ru/award?keyword=building+elevation+drawing+pdf
    • https://cdn-cms.f-static.net/uploads/4474979/normal_60517d6f41660.pdf
    • https://babexunerasosib.weebly.com/uploads/1/3/4/6/134620176/napuzepemisabavesaga.pdf
    • https://static.s123-cdn-static.com/uploads/4450037/normal_5ff188778aea5.pdf
    • https://cdn-cms.f-static.net/uploads/4419628/normal_601420a376a32.pdf
    • https://gepadera.weebly.com/uploads/1/3/0/7/130740344/0b8a992.pdf
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5fdf9cc5bd7aa.pdf
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/3207639.pdf
    • http://luxisulejoxo.getenjoyment.net/list_of_auditors_in_chennai.pdf
    • http://bagomebefekixob.getenjoyment.net/numimedujoxovad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_13a57a10360347e3ad258928e9bc93b4.pdf?index=true
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_b51a44b08d4a4847b420e6468c5ec8c6.pdf?index=true
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_420eef82eee84bc38623c92c8c58a04c.pdf?index=true
    • https://38a589f5-619b-4230-bc7d-f88d9fc6dac5.filesusr.com/ugd/392051_aabcb55984584f4f9c65e88ada4de9d4.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_60ad523e5f4e455f8b8a5f2255eb7406.pdf?index=true
    • http://tajavuminona.atwebpages.com/99583304622.pdf
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_812821e378ae48a19afc03b510512081.pdf?index=true
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_3dec424720ca4d3b9b53ea73b938275d.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_off0000e570.bin
57137e2177c571c02f37cbce993a15fba5a7b1a2837428dc6a54ab62a78f58d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 5232 bytes
font_01_sfnt_off0000f76c.bin
cb24c25bf02ca5f29ed15e6b7ec124d4ccef02237ea0df5f6164c9cfa234544a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 10396 bytes

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