Malicious PDF — malware analysis report

Static analysis result for SHA-256 664f6d99d137776f…

MALICIOUS

PDF

71.7 KB Created: 2021-01-14 14:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ada94bbcd32678d5cf871e03fc54e38b SHA-1: bd39b0a25de9e12edcef616197d05e4ec7a59231 SHA-256: 664f6d99d137776ff29206f4c27b0407c6b537792a815a5dbed13c34ad3b0c5e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://cctraff.ru/123?utm_term=estwing+camp+axe+mods'. ML classification and ClamAV also flagged the file as malicious. While no scripts were extracted, the presence of a malicious URL strongly suggests an attempt to lure the user to a compromised site for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/123?utm_term=estwing+camp+axe+mods In PDF document text
    • https://gelujesu.weebly.com/uploads/1/3/4/8/134847850/2291118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5ff9ff73e1543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365621/normal_5fc89b508ad0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371814/normal_5fcda0778d1b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_5f8815d0775c4.pdfIn PDF document text
    • https://xezuzevujuniz.weebly.com/uploads/1/3/4/5/134586082/zemipiberotisu_fazufe.pdfIn PDF document text
    • https://site-1174473.mozfiles.com/files/1174473/go_kart_racer_kart_racing_3d_game_online.pdfIn PDF document text
    • https://fibakuguzisenib.weebly.com/uploads/1/3/4/5/134594550/1248bb4d.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/fajetufekejo/de_jogos_para_nintendo_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/garador_s_flight_piano_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 2968 bytes
SHA-256: 1c91280eb79ffdc858b6ecd2b9b1b9121e398c569f5702dd47e27479ee3b0056
font_01_sfnt_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 5380 bytes
SHA-256: a0d999183dd191c0d831bf77a35535f7a470db101538fb454a6f0e3d3686f675
font_02_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 10392 bytes
SHA-256: 4b79a8eeba9307d04b165816a8a00eb49d20460175b666c3092c3f9f22eb2d3b