Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f764da4ddcfaa8c…

MALICIOUS

PDF

72.4 KB Created: 2020-12-15 19:34:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cb172269810afb8f96f682217f9e904d SHA-1: d83c0c6ace720651637a07ab97a78136554dd815 SHA-256: 4f764da4ddcfaa8cbe21753ad8727de2feea1e17aa2da45ccfd85771ff4ff563
104 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a movie download link, suggesting a phishing or social engineering lure. ClamAV detection and ML classification strongly indicate malicious intent, likely to trick users into downloading malware. No scripts were extracted, but the presence of an external URI and the document's nature point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?utm_term=bram+stoker%2527+s+dracula+movie++480p PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487184/normal_5fcf03934a8ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5fa244b9779bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470830/normal_5faa82c8c8356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5f903fd4f0d8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469358/normal_5fc22d1e76504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406216/normal_5f9e527e5805d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fcf09836d04bc46d03b90d4/t/5fcff6f1d2669313d1b743b7/1607464690181/24514062900.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/kitchen_gizmo_sous_vide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f7235687f52b6b817f64/t/5fd19b40ae71ea6dd31a9fc4/1607572294932/teachers_salary_part_time.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD98 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000ce7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 5852 bytes
SHA-256: 4345a23f79b98e1501e863342d426a72f91caa227873e26ef603ae05361d9c82
font_02_sfnt_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 2116 bytes
SHA-256: 991f7ef292b59849fa1804c361c52a6255426db797fbcab3b5d31d1f34ee76c9
font_03_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 11212 bytes
SHA-256: ae7728f9df0bc34cff64c4f860d1bcebe6246b3d83958f6cce40c72d44322ff0

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