Malicious PDF — malware analysis report

Static analysis result for SHA-256 28733b27a18cb119…

MALICIOUS

PDF

66.6 KB Created: 2020-11-10 08:02:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f667914d3855a820852c0d08a48fa2db SHA-1: d81e72a42781aeffe4ffd98db3806432d7f84ea3 SHA-256: 28733b27a18cb119dffc81628fdc758836df03bab3797e27471474543d65d41b
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?keyword=oswald+chambers+pdf'. 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 a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?keyword=oswald+chambers+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f963532ec848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5f9cb55d9943a.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/38462199-8fc8-4faf-bf89-492a3696b080/pisasifediderilarem.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/cuales_son_los_derechos_humanos_laborales.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/29509953413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4507cd6-85d1-4e7b-9c09-209f5480ab5f/nuditevisagutibejaxorer.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/51181389333.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/gopro_camera_with_night_vision.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcacb4b3-56a3-425e-93ed-081a11f947ad/jeregamirofafase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22791b67-c846-4c6c-bf2c-056059f3d1e4/16209795678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a90bf0-1049-4bf0-baf1-bb806c1c0646/tifurabonajovasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38ebee10-c63a-445c-a429-6c94b8a61405/28888468809.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_off0000c7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 5656 bytes
SHA-256: e470f4dce0056430b229ba614d769fe7e56b4cfaa49868fe3df58661fb55ed7a
font_01_sfnt_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 10376 bytes
SHA-256: 64adb0c8c1898480761101032bf471f4f859ba706474dc724fdd327806fb7892

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