Malicious PDF — malware analysis report

Static analysis result for SHA-256 4987fb4d1af3f6cc…

MALICIOUS

PDF

70.1 KB Created: 2020-12-17 14:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 204a495a5c631066d1a5e57f8845f400 SHA-1: 30bf9d89304f2dcd7897ba4b44c5830bddeb3dcf SHA-256: 4987fb4d1af3f6cc1052e45087cd074e239de7c04e7f2ef7c848c7edf34267e9
96 Risk Score

Malware Insights

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

The file is a PDF document that contains obfuscated text and an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL, 'https://traffnew.ru/strik?utm_term=yamaha+rxv373+manual', is likely a phishing or malware distribution link, disguised as a product manual to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=yamaha+rxv373+manual
    • https://static.s123-cdn-static.com/uploads/4471958/normal_5fcbff712c4b1.pdf
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5fb80a50ebb08.pdf
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5fb538e482fc8.pdf
    • https://cdn-cms.f-static.net/uploads/4407084/normal_5f9a6448a1294.pdf
    • https://static.s123-cdn-static.com/uploads/4407781/normal_5fc44a70e887c.pdf
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5fad5a124a168.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ditiruz/vidmate_app_apkpure.pdf
    • https://uploads.strikinglycdn.com/files/0ce885fb-3033-4dc1-9b9f-eb46c005362c/11194445343.pdf
    • https://s3.amazonaws.com/babetafaperaxov/ratowaki.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/raees_film_video_songs_free.pdf
    • https://uploads.strikinglycdn.com/files/e9aef115-237b-4e2d-b7d2-24f7273df000/kilozuluxanokenobav.pdf
    • https://s3.amazonaws.com/lorifawuvawot/wezejofimev.pdf
    • https://s3.amazonaws.com/midipes/future_laboratory_report.pdf
    • https://s3.amazonaws.com/nemafu/centrifugal_pump_design_tuzson.pdf
    • https://s3.amazonaws.com/kizugokofo/android_studio_setting_ndk_path.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d236.bin
78b48b531dd1093bba61a1b5e4e9a479f7e8b6d549684626a92c6afe48c46817		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 5080 bytes
font_01_sfnt_off0000e367.bin
4fee15205d0a12b9d8686c7e8f27ae938277cfde6e231f7a8d05b882a42674f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 11768 bytes

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