Malicious PDF — malware analysis report

Static analysis result for SHA-256 8200128e3365e2ca…

MALICIOUS

PDF

83.5 KB Created: 2021-03-21 09:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f20cbff90df8df6c828ca1ef264b7f78 SHA-1: 1e9aaf2c48dd37b0f08d245fd5b00490a428ebfe SHA-256: 8200128e3365e2caedba5b469e072a1cc88c559a4d5b7e7f20bad5df71ea0dad
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=current+fishing+report+san+diego
    • http://jotafitosixa.getenjoyment.net/wagemewefotofasobufudiwa.pdf
    • https://cdn.sqhk.co/lukisebeka/jjajehj/18914005013.pdf
    • http://fazojum.66ghz.com/informal_agents_of_social_control_definition.pdf
    • https://cdn.sqhk.co/xezafube/dOihjgg/water_race_3d_online.pdf
    • https://cdn.sqhk.co/tibatojo/Bd7Yidl/29362955929.pdf
    • https://cdn.sqhk.co/fularulojoze/cAigd7M/movie_trivia_quizzes.pdf
    • https://cdn.sqhk.co/jabuvilir/idjqfPC/defadusidikamejimom.pdf
    • http://levotavo.scienceontheweb.net/4489416221.pdf
    • http://gomigapujasep.sportsontheweb.net/zapepibexepotamukujemeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/163eee24-a4bf-45fd-a6aa-7ae8b7348206/the_sandman_neil_gaiman_film.pdf
    • https://uploads.strikinglycdn.com/files/4d4fb642-45cf-4517-8463-43af0290fee5/89384565928.pdf
    • https://uploads.strikinglycdn.com/files/46410d06-096f-4f0f-8945-551c102c2949/depojumudafezitigerewex.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_97afa618a80e4f109296374011c08b98.pdf?index=true
    • http://dikawixum.epizy.com/dakelimuw.pdf
    • https://uploads.strikinglycdn.com/files/4b692f30-a104-4fe8-becb-c7d534c5f264/loxoputezafamejusefal.pdf
    • https://uploads.strikinglycdn.com/files/20b87dc6-e19c-44ce-8f63-e9291d5f9c52/17025833177.pdf
    • https://uploads.strikinglycdn.com/files/25029fea-ba0a-4b6e-afa9-cc060b410790/76174671127.pdf
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_abee65b76556403e8c39fad28cb163ce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f246398-7125-4d16-a6c6-38d0db6e17fa/samsung_fridge_ice_maker_not_dispensing_ice.pdf
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_e9033ab0442541dbae9e635e3d34e054.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f882.bin
029d56e96458ad49dbc6a2bce2ea8aeddfff7ccec4096322d372c9d8ce23c437		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 5176 bytes
font_01_sfnt_off00010a16.bin
7838460912585ecfb7eeed413bf58f038123375f8130e1885a75f2f97e21afa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 12064 bytes
font_02_sfnt_off000132ba.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132BA 4324 bytes

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