Malicious PDF — malware analysis report

Static analysis result for SHA-256 8463d55e151b6812…

MALICIOUS

PDF

65.3 KB Created: 2020-11-18 14:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e661ddecec09a42ff22972201b48ece0 SHA-1: 10e00a81f6208c0b175a25546a0583269fb5fbd3 SHA-256: 8463d55e151b68127f5b45eea290c29197a4c4ac73e70f7c2ffb0dfb17a1d1fd
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://traffmen.ru/strik?utm_term=four+against+darkness+review'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=four+against+darkness+review In PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/f0a367.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/af0e2240-5107-4bf0-a66c-2007aa8422f6/47197031824.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/69618624331.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/jio_video_calling_app_now.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/dolufikufexobuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48aaab86-2fc5-4e4f-b3ed-6612ffa8c1bc/lms_killbook_of_a_bounty_hunter.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/sewikejesusubi.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/tebixapevikejeputu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a169700-8fa8-4403-b511-2c890ea24bc5/5800259990.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/maths_ncert_class_10_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e4c31d-3013-498c-a101-ab55323efac4/alain_badiou_ethics.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_off0000c4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CF 5132 bytes
SHA-256: 9dbaf669e2f9f84ae2e83cfa4ae3b87e0fcd562d8ac1bd8ece97fbc5ccf67c06
font_01_sfnt_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 10116 bytes
SHA-256: 7f8c483ee927527763930399dc1041a73ec9f8b53e90ace101e64a0eab037d60