Malicious PDF — malware analysis report

Static analysis result for SHA-256 96584f35f1e0f8af…

MALICIOUS

PDF

77.2 KB Created: 2021-02-15 22:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dd8e00281604262ecc642a53ddbeb019 SHA-1: 7df56fd3ae20dca467e46cded4c5077b5b91c5ea SHA-256: 96584f35f1e0f8afe6143aaf448241d578b6f750b6535928f77c00ef8a4590ff
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, suggests a technical topic ('Fundamentos tecnicos del voleibol el voleo') which is likely a lure. The presence of embedded URLs and the ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/123?utm_term=fundamentos+tecnicos+del+voleibol+el+voleo PDF link annotation
    • https://babobulelemin.weebly.com/uploads/1/3/5/3/135344535/menafajeta_tepup_dizuxavonexid_futetupux.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/1185013.pdfIn PDF document text
    • http://weinmvc.net/54197451366t3gbj.pdfIn PDF document text
    • http://creditactive.info/senanoxime81xaj.pdfIn PDF document text
    • https://gekuraneg.weebly.com/uploads/1/3/1/6/131637503/ruxuvupiruvoju.pdfIn PDF document text
    • http://xodokevazijif.22web.org/87783008027.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/safadizawiwogew.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/74039203685.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/broomfield_police_accident_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/dazidujalivi.pdfIn PDF document text
    • http://wepebafefik.rf.gd/ledefiseb.pdfIn PDF document text
    • http://pukunoganisopa.epizy.com/76911418669.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/mewegori.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/89540892206.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/goatlings_explore_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 5144 bytes
SHA-256: 077ae82fa95c7f14cb5f81a0c871d2d3c9c14f602ad6e006e6a7b936398dd0e9
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 11488 bytes
SHA-256: 8594ad32a08bde7b32b284a7ee7e84fb4dcd28649222f25a774fa223f8b8c781

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