Malicious PDF — malware analysis report

Static analysis result for SHA-256 9138c4a721df91ad…

MALICIOUS

PDF

64.7 KB Created: 2021-01-01 05:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 23d28b1d6ae3ac8f9a8a87a30d4df3d3 SHA-1: 1b76b177bce114a91d89bb39135d965d56a8f6e7 SHA-256: 9138c4a721df91ad61ec0369ad17ece812f984f243bf0bca36f416791213fd0c
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://traffine.ru/123?utm_term=querer+practice+worksheet'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The document body, though heavily obfuscated, appears to be a worksheet, suggesting a lure to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://traffine.ru/123?utm_term=querer+practice+worksheet In PDF document text
    • https://fuzakeraza.weebly.com/uploads/1/3/4/8/134848422/goxetomigo.pdfIn PDF document text
    • https://cdn.sqhk.co/wiluxuko/hjBjjOZ/5766526064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88028ad0-eab3-4fa9-8f1b-21e951d26544/28635224873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ae3182-4d8b-4936-9a25-4ed7161f94c3/sisters_thai_cafe_rockford_illinois.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd0c7fd-ae3c-4fd5-95d4-b5543157dce5/forumipokenakat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c87b1352-c28f-4e9d-96f2-d54fc0f977e2/walton_county_arrest_search.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/24383920119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f966758f-f331-4d6d-aa2e-6b45927c9cf4/basinuwuzisiwikosakido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b40ea3-4c6f-41b0-8e1c-789e32e4a175/pixel_gun_3d_hack_no_human_verification_or_survey_or_download_2020.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_off0000c1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E4 5208 bytes
SHA-256: 03eac0e075820917b1fcb05e5388e02df8b56f7c4060148f78d921e8a9eae8ef
font_01_sfnt_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 10256 bytes
SHA-256: 9886996161a81c09e259f59f2b2f9272a7e6c4c27b73383c3a6e65f31c7e8980