Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2444c91a6037ae3…

MALICIOUS

PDF

80.6 KB Created: 2021-02-09 04:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 92c0e10b841e59e3b6aacaef9fc85192 SHA-1: c60cc3220886d4295aa3afacfe66f3f152635111 SHA-256: d2444c91a6037ae37c44b2a3e07c92a3202ad3268e2a8ade04d6dbbbf83d79d4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the embedded URL is the primary indicator of compromise, suggesting a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/aws?utm_term=snake+xenzia+game++for+android In PDF document text
    • https://cdn.sqhk.co/moxulofilose/giJjeii/cake_art_shop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_5fe9aa9843825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_5fe905a991bb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488815/normal_5fe15ebde1e90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_600e97d505fc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fcf49eae9429.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/umierih/dilizanuwuguxodiwilev.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/ifgfweo/cops_n_robbers_2_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_5fd9d01c4cb31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_601f08a6bf517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_601b74ca0e99c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5fe532069f67f.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/ia9EmLk/72297398318.pdfIn PDF document text
    • http://nakrutkavk.site/caveat_petition_format_madras_high_courtuwan6.pdfIn PDF document text
    • http://quinzsy-studio.design/primary_and_secondary_colour_wheel_worksheetey77h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasosuwer.epizy.com/chsl_2019_form_date.pdfIn PDF document text
    • http://zojopek.epizy.com/79485150557.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_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 5300 bytes
SHA-256: 75580bc38ddcbf6319232f8fb8bdf529538756a838b4ce38f3989e27ee9c04e7
font_01_sfnt_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 10676 bytes
SHA-256: 2942c27ed46371b26a3df3451f3a3e0767720dae97c51852559d4d634e280314

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