Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c8beaf0d194f09…

MALICIOUS

PDF

66.2 KB Created: 2020-12-18 09:24:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b64c16666709a49daf3a8a5ea86c8490 SHA-1: 96eabfa23d008fd878a0af0c901a7fe6f30f71c2 SHA-256: 04c8beaf0d194f09ede97edd20b9b60811d5ff04326ea4bef4342b929f711715
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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://traffmen.ru/123?utm_term=determinant+of+a+2x2+matrix+pdf'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. While no scripts were extracted, the presence of a malicious URL strongly suggests a phishing or malware delivery attempt, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://traffmen.ru/123?utm_term=determinant+of+a+2x2+matrix+pdf In PDF document text
    • https://xigefazevape.weebly.com/uploads/1/3/4/6/134632801/sekolileromutekej.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/5fc0e7c288c99b6d37a72027/t/5fc741188f07963615771a12/1606893849379/wooden_craft_ideas_welcome_signs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c4005fa-5a72-4140-a741-0eb138b6157e/quadratic_formula_and_discriminant_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c05d6b97992eb567e8ce/t/5fc66a4b2dd96f5918c9652a/1606838861535/bright_hope_dog_training.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/31015353140.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/deliketebemagukejosije.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6973cbd14ff0dd2c3fa9e/t/5fd15cb1133bcb3b888f11e3/1607556274131/the_trial_of_the_chicago_7_accuracy.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/best_guided_tours_mexico_city.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_off0000c39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39C 5176 bytes
SHA-256: b73de177f88e4dc78ad5a089e3797706754281d72852a7dad73f7fbfbfd7ff55
font_01_sfnt_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 11624 bytes
SHA-256: 99847d4b30e135b76be47ea0f477a9169332c8ecabfb983701112222679b6e46

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