Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f7dd71690947ed…

MALICIOUS

PDF

67.5 KB Created: 2020-11-27 13:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2545798d89c52925c0c4231c96fecc8f SHA-1: 6135863b80e924bfb7a4ca03191b8c1949d946b8 SHA-256: 61f7dd71690947ed82da05dfe9e3feb00acfe5fc7ef1412187df88caca72c242
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://traffmen.ru/strik?utm_term=dr+web+security+space+life+apk'. This URL is presented in a context that suggests a lure for downloading security software, which is a common phishing tactic. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=dr+web+security+space+life+apk In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purawuma/38307413226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50243888-8793-4fe1-8b44-d41854a4d943/magna_carta_student_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2da91d-3712-4704-9576-18c6975b8171/ekogen_definition_ultraljud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe4ab16-484c-4788-b2be-c7e7a677b7bb/broadcast_announcing_worktext.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156a0fe0-5f7a-446a-8596-e50be9dc7770/vurigezivesaxawolovajawa.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/usb_loader_gx_initialize_usb_device.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/510f2504-60f0-4200-829b-7ae4113c2b8d/windows_10_antivirus_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ca4ce8-c217-4e21-a550-7b4d8f75e194/kegugasunavoduwor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e5f93b-df99-4ae2-a00f-9f3869a32a32/58984856719.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/belleza_y_estetica_in_english.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_off0000cbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC8 5404 bytes
SHA-256: 9d21baad98463d430580e4a202df31e2835778a599e7d22864f2c9c297560dae
font_01_sfnt_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 10404 bytes
SHA-256: bf77fcce5efb4539f3483602881cf5f3788f1cde762b5597314a7a084afae16a

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