Malicious PDF — malware analysis report

Static analysis result for SHA-256 490bf90b9cb88214…

MALICIOUS

PDF

72.9 KB Created: 2021-02-14 16:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 111dd83e1cfa957879da2fd2215fad78 SHA-1: 68af2438391db3a6e3a8d1a39157ba79b2c55237 SHA-256: 490bf90b9cb882148f7346171e152d7d2e524b69e68e474dad14d2f60ef7f23d
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://crophysi.ru/123?utm_term=lausd+e+library'. Heuristics and a machine learning classifier strongly indicate malicious intent, with ClamAV also detecting it as a phishing trojan. The primary attack pattern involves luring the user to a malicious site via a deceptive link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=lausd+e+library In PDF document text
    • https://cdn.sqhk.co/xijodepub/gijfhgZ/sefivomi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fc88b6b3c62a.pdfIn PDF document text
    • http://creamwalls.space/ambala_video_song10plj.pdfIn PDF document text
    • http://se-mrush.com/jopelevufivufebez02uq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480595/normal_6001ce771ee75.pdfIn PDF document text
    • http://agreevudb.rest/vintage_leather_race_jacketsciit.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuzasana/lnha3dS/43089779113.pdfIn PDF document text
    • http://distornyup.site/bujibirugeal4i3.pdfIn PDF document text
    • http://wowit.pro/vizupuladowodoqxx3j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370302/normal_5ff7f0bec59ed.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/zoromexemuzid/royal_mail_envelope_size_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/dojexumixulenoselat.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/grade_7_divisibility_rules_worksheet.pdfIn PDF document text
    • http://luxixeg.epizy.com/naxefivineduxevizabux.pdfIn PDF document text
    • http://zemagarekerak.epizy.com/kuzabuxigunipumav.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/koninosi.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_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 5000 bytes
SHA-256: d6d49cce3ced4d2d62f228518d27e10e83fcc071633f9d38db86aed24cf3b0c1
font_01_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 11792 bytes
SHA-256: 80a9dfd749dc4bb50e628286354997f2cea50d140c638277ea251de3308ede77

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