Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58f6c9e12c72e35…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 03:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1f530788d4e9b1b05b7f760eb76ec50 SHA-1: 4a46515c3c46233a9e761e8793f95049e1f73b30 SHA-256: a58f6c9e12c72e3561e55598ee67fedc7b05af2859f37894f0d4edbf140e9b25
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'kuzutuzo.ru', which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, suggests a lure related to 'bascules pdf' and award information.

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://kuzutuzo.ru/award?keyword=td+sur+les+bascules+pdf
    • https://cdn-cms.f-static.net/uploads/4381980/normal_601cfeb59bf03.pdf
    • https://cdn-cms.f-static.net/uploads/4451350/normal_60506aa57d061.pdf
    • http://santand-es.com/teaching_english_as_a_foreign_language_free_online_courseyc7ns.pdf
    • https://cdn-cms.f-static.net/uploads/4457302/normal_6035b34e8a493.pdf
    • https://cdn-cms.f-static.net/uploads/4490516/normal_601594425f165.pdf
    • https://static.s123-cdn-static.com/uploads/4405202/normal_5fceddfdc22eb.pdf
    • https://cdn.sqhk.co/pubodegosog/bhbzNbD/jbl_music_player.pdf
    • http://givikoninebana.22web.org/programmable_logic_controllers_principles_and_applications_by_john_w_webb_download.pdf
    • http://microdigitalmeter.xyz/gidanegosuga1anmg.pdf
    • http://healthyforczechrepublic.site/majavowepatetijisisu71nge.pdf
    • https://static.s123-cdn-static.com/uploads/4378618/normal_60045de4c5733.pdf
    • https://cdn-cms.f-static.net/uploads/4484359/normal_60505cf55118e.pdf
    • https://cdn.sqhk.co/logulemuset/xjeijh8/stormfall_saga_of_survival_mod_apk_2020.pdf
    • https://cdn.sqhk.co/ganuniwiku/eEPujj0/xifomukebiwupurupetelula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kubunixa.epizy.com/49664113944.pdf
    • https://s3.amazonaws.com/muxozuvalubi/gojuruzizivipavizexizozid.pdf
    • https://s3.amazonaws.com/fezenur/best_kalymnos_climbing_guide.pdf
    • http://vokerajud.epizy.com/ap_human_geography_vocab_chapter_1.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d663.bin
1ba1a6f9f487e05874e5ec73a080dfc95b80e599961dc1d36f6579213ba2aafd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 5236 bytes
font_01_sfnt_off0000e836.bin
f71b1b90f22235d020b67a77531b73c520f0eb03d1a7d33dc54142f0e02c4259
pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 11788 bytes
font_02_sfnt_off00010e86.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 16204 bytes