Malicious PDF — malware analysis report

Static analysis result for SHA-256 249a39c57ce820f4…

MALICIOUS

PDF

74.1 KB Created: 2021-02-14 05:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 00994e767400a22607f66b37941dbee9 SHA-1: c75d96afb4ca9a3d9e0a2f764e94a03693548407 SHA-256: 249a39c57ce820f455fee6ce55481bce5b1b2cf5949f1959cc7e434415bb0935
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru', and a high number of embedded links, many of which are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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=i+am+j+cris+beam+pdf+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5ff3017a07b64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_60287677f06a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460980/normal_5fcc615067f8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_601e87566d72a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403415/normal_5fef93c88274d.pdfIn PDF document text
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/mujapasovogivezufiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_5fd644c28deb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501486/normal_5fed5772e4421.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409799/normal_5fde58cd3fe00.pdfIn PDF document text
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/9aa0bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5fd10c756764d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_601481b4d4aa8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5fc7a86951f63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485813/normal_5fee474360fba.pdfIn PDF document text
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/5a3b67eb1.pdfIn PDF document text
    • https://mobefoba.weebly.com/uploads/1/3/0/7/130776725/7750808.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/widiku/answers_to_interview_questions_weakness_and_strengths.pdfIn PDF document text
    • http://pibekolovaxizon.epizy.com/bambukat_full_movie_480p.pdfIn PDF document text
    • http://wudokuzogikozu.rf.gd/bombay_dyeing_bedsheet_online.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_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 5548 bytes
SHA-256: 486968bb0e2d7a622d794f4caa1dd9212c3b2cc0c1ede0562c794f69e00ddd7d
font_01_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 10604 bytes
SHA-256: f8e11e46fe5e117d65f64534c87aaaa098a10cddcbf9c39fcf85ba061d61b6af

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