Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b75b62099b5bfb…

MALICIOUS

PDF

71.8 KB Created: 2021-01-17 10:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 351965d7e5ada059a21acc1d00812830 SHA-1: 5610e2ac693649bccb5e59c44d4ccedd64e8f52e SHA-256: a9b75b62099b5bfb6031257c3e72f909056d198c3ab4997dfe28def2e948bf88
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/123?utm_term=root+file+browser+apk'. This indicates the document's primary purpose is to lure the user to a potentially malicious site. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

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/123?utm_term=root+file+browser+apk In PDF document text
    • https://cdn.sqhk.co/gituridewo/iahcjbG/89216618125.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fdda0f7147ce.pdfIn PDF document text
    • https://site-1172777.mozfiles.com/files/1172777/liminubotudafoxef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f9e12803be21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5ff8dd9a8c87e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448124/normal_5ffba0be5eb36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f8d1ab4637d8.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/hiEr9gd/travellers_backpack_mod_minecraft_pe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_5ffbefb9ebd29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5f9c7bb28c5d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/elastic_heart_sia_sheet_music.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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 5196 bytes
SHA-256: bf670d271f9470e1ed920869c44b84aa15cd7dc51a80f6314b0706e19d77a0b2
font_01_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 10636 bytes
SHA-256: 9ed00cef48434fb03a3b7a99c21158e2bcb0eef366d5b85768a57613311d891f