Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4af0d556d33e65…

MALICIOUS

PDF

68.5 KB Created: 2021-02-17 16:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3748c2481e88e4443449ff36efdb0942 SHA-1: ea1c11c6cad94ee94e3e40f52a71fe87c9524e1c SHA-256: da4af0d556d33e65abdea49c3c6edef0e2a220ea689f8d0a7b16e38c1c3f0372
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially harmful 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://jacksth.ru/wix?keyword=being+there+quotes+for+someone+you+love PDF link annotation
    • https://gefetejumifigo.weebly.com/uploads/1/3/4/6/134688955/buxetononut.pdfIn PDF document text
    • http://towumodoxilokox.22web.org/37400326262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385230/normal_5fdfd306c859d.pdfIn PDF document text
    • https://gupobotinifetex.weebly.com/uploads/1/3/4/3/134338345/fofisodukakex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387586/normal_5ff0e872da636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_6023d0ad47889.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416805/normal_5ff9a72ddc4ed.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/monowofu_vasugurojuka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozijirume.rf.gd/38245187526.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/katyusha_music_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/cours_de_francais_niveau_b2.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/fefovavugigenesi.pdfIn PDF document text
    • http://texatopewewew.epizy.com/8601111556.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/pamuze.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_off0000d1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CF 5308 bytes
SHA-256: 46cf9ae5ed00f8bab7574f4c6414925ef42657f13abaa543f3efca169bfa3272
font_01_sfnt_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 9772 bytes
SHA-256: 98c3575141362d342cc4b249c104adfbb39d4f49a321fdc0e155bd6a95112503

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