Malicious PDF — malware analysis report

Static analysis result for SHA-256 b937f37ea7e9ed01…

MALICIOUS

PDF

71.9 KB Created: 2020-12-07 21:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f95ebb6fa2f9b3aebdf9e9438e89c9d SHA-1: 7c83fbc28dc6b2d12ecd1f3a07dc82a14faec8b4 SHA-256: b937f37ea7e9ed01b42e65f034a69f950a515ba948dea7409eb27cdc06173e50
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating an embedded external URI. The PDF document contains obfuscated text and an external URL, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of an external URI points towards a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafffe.ru/strik?utm_term=what+is+an+inflectional+ending
    • https://cdn-cms.f-static.net/uploads/4387046/normal_5faf6550b1837.pdf
    • https://cdn-cms.f-static.net/uploads/4447640/normal_5faaa8c3e2448.pdf
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f8748ca991b1.pdf
    • https://cdn-cms.f-static.net/uploads/4405642/normal_5f9ac9652404d.pdf
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5f8b62f84a8f8.pdf
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5fcb3884cf8ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nisoxow/44208734395.pdf
    • https://static1.squarespace.com/static/5fc27eb48ef7301f8b1ae02f/t/5fce1803d336b863f0e9b3dc/1607342084605/3973457221.pdf
    • https://s3.amazonaws.com/dazifozixawus/ruzipuxoxojizokaveforagab.pdf
    • https://static1.squarespace.com/static/5fc0d650403f5353fd956949/t/5fc3f4d11972c46e3c181e0f/1606677716033/kassadin_guide_s5.pdf
    • https://static1.squarespace.com/static/5fc51cd00b6b03258f50a19d/t/5fcae38364036b614381fe58/1607132038768/dark_souls_3_dark_knight_sword_build.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8c.bin
b9aef1fc894ed065f3b0f3996ceff2be3292da640433cb434e2a6ef4de9a2d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 3008 bytes
font_01_sfnt_off0000d855.bin
3b6a7ef0d013f8b6ceb801ad9e91220572538946e0e5c464235afb8dc78e9a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 5200 bytes
font_02_sfnt_off0000ea16.bin
cbc31418bb0ab308e62abc18b653d01f6a8a2b5719d68a0e1ec1a2d5ef6ae850		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 12344 bytes

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