Malicious PDF — malware analysis report

Static analysis result for SHA-256 90597ab98d38d7e3…

MALICIOUS

PDF

88.5 KB Created: 2020-12-21 12:35:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 92cf5a503bffb4253f554a0024fb02f8 SHA-1: 97d5c127617de66524e50a8897d66cd02deb55dd SHA-256: 90597ab98d38d7e3026c714cfd3313fef41033105dbd283d23bc33dd5690cd9d
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://gettraff.ru/aws?utm_term=orthology+and+paralogy+in+bioinformatics'. This indicates the document's primary purpose is to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://gettraff.ru/aws?utm_term=orthology+and+paralogy+in+bioinformatics In PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/c0286a1.pdfIn PDF document text
    • https://josugonu.weebly.com/uploads/1/3/4/4/134488469/puzupununafilulon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fdd8c5c19b7c.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/3236539.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/puxuluwatudegusetiko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5112e12facd59cec7c30d/t/5fc53cd4cb3e0f5771fa40ab/1606761684559/9056437352.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/th_phonics_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/pobeximimezixafedekawawa.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/october_31_2021_minus_90_days.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_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 5836 bytes
SHA-256: 822796f609ef6e62c5bc66ed3b9b54083e2341e5cce94a35c4881ca1a273f85f
font_01_sfnt_off000130d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D6 10672 bytes
SHA-256: 63d458a43e51f8f15c9b9deccd499bb1eb17bf0a856914dae736b25933dc8aa9