Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c856e9b45dc2035…

MALICIOUS

PDF

74.3 KB Created: 2021-02-25 09:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e446d51ada7c8d833634f6eb21ec13cc SHA-1: 640a51b95fd7adbffc374c8688d683e3868e0727 SHA-256: 6c856e9b45dc2035bf0b2f4bb1df57d445fea268ee2b170b63cf1dddd1e3cbc8
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 'https://crophysi.ru/wix?keyword=howard+hughes+libro+pdf'. This URL is presented in a way that suggests it is a search result, likely to trick the user into clicking it. The ML classifier also strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. No scripts were extracted, but the presence of a malicious URL is sufficient to indicate a phishing or redirection 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/wix?keyword=howard+hughes+libro+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4491169/normal_60045a198259c.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/jhieEZ4/fofaxipo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382196/normal_5fcfea609b91d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_600bc3f67ba5f.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/har5Cjc/graphic_design_portfolio_inspiration.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_601b2c7ab4846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_5fcb181476c04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5ff5bd9c2dd79.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/widuxade/zowunelutudavovox.pdfIn PDF document text
    • http://jukiwifid.rf.gd/ascus_pap_follow_up_guidelines.pdfIn PDF document text
    • http://jidabalelibixu.rf.gd/56096203231.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/6500842825.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/kopudorunex.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/77597981310.pdfIn PDF document text
    • http://komusera.rf.gd/jolapikif.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/cinema_intro_after_effects_template_free.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_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 5496 bytes
SHA-256: 02140562ba4f73e1191025d0ac5c41de69a17d29fc460746976264ad07d26600
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 10504 bytes
SHA-256: 0d1520ef104fb1a22792396895cd34f2c61313bc6080a1fb6bbd9c7a364529c2

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