Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a76b654c98e0cb…

MALICIOUS

PDF

75.7 KB Created: 2021-01-18 02:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e3cc9de4c90c92c4e5a31741bbb21dc3 SHA-1: d1a7b3845c739e9a36d05fe993f6851017c556b2 SHA-256: 85a76b654c98e0cbf6d5f9dee777f04f57bef705f8d8d8a7bfdf749a7f65e937
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, traffset.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to the URL, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffset.ru/123?utm_term=martin+custom+d+review PDF link annotation
    • https://site-1191940.mozfiles.com/files/1191940/apparatus_in_laboratory.pdfIn PDF document text
    • https://site-1177929.mozfiles.com/files/1177929/fojol.pdfIn PDF document text
    • https://site-1185109.mozfiles.com/files/1185109/gutuf.pdfIn PDF document text
    • https://site-1178850.mozfiles.com/files/1178850/rifajo.pdfIn PDF document text
    • https://site-1172017.mozfiles.com/files/1172017/rotutizusoxufo.pdfIn PDF document text
    • https://site-1178372.mozfiles.com/files/1178372/zibubilorizizulebilofu.pdfIn PDF document text
    • https://site-1188059.mozfiles.com/files/1188059/19415016545.pdfIn PDF document text
    • https://site-1173528.mozfiles.com/files/1173528/rush_limbaugh_live_today_youtube.pdfIn PDF document text
    • https://site-1244778.mozfiles.com/files/1244778/install_android_apps_on_linux.pdfIn PDF document text
    • https://site-1171776.mozfiles.com/files/1171776/chirutha_movie_songs_free_naa.pdfIn PDF document text
    • https://site-1167926.mozfiles.com/files/1167926/building_services_engineering_degree.pdfIn PDF document text
    • https://site-1175497.mozfiles.com/files/1175497/drag_racing_gear_oil.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/ritoma/best_wallpapers_for_laptop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/arjun_reddy_movie_photos_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/vibove/vafinepiz.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/ps2_emulator_roms_games_free.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_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 5212 bytes
SHA-256: 3d4224e09f1bc16e556a24bf631393b4b990b7ef2ecc8652198fe7a0588816a1
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 10632 bytes
SHA-256: 935b419035dbdb7adb092c4a36f096e8a3ce8fa532123a8c769cb3d1af537644

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