Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73941b8fbbe540e…

MALICIOUS

PDF

75.7 KB Created: 2021-04-08 07:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baa3915a95b7ac47a7723b30b90f2353 SHA-1: b640a6bfb1842fcaa44999b7c87dc4bfe21ff9bd SHA-256: f73941b8fbbe540e8d418b7316cf7bfb8423babc8cce6d36b405d72c59678048
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL, https://kuzutuzo.ru/strik?utm_term=jersey+mike%2527s+club+sub+calories, is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains keywords related to a lure, suggesting a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kuzutuzo.ru/strik?utm_term=jersey+mike%2527s+club+sub+calories
    • https://cdn.sqhk.co/zirigajer/hh76iar/mupabikupujajuj.pdf
    • https://cdn.sqhk.co/mokabawimav/hjfdMDy/23118413417.pdf
    • https://cdn.sqhk.co/wizevomorofe/aHWk7Jw/maverik_rewards_app_download.pdf
    • https://cdn.sqhk.co/sogupavetut/3wh94gf/left_handed_calligraphy_practice_sheets.pdf
    • http://jusibebobekig.iblogger.org/najoduminebupovezo.pdf
    • https://cdn.sqhk.co/keropolor/jjHjfLB/tikamujexesojogavitobo.pdf
    • https://cdn.sqhk.co/futevanu/wVGgija/98973846843.pdf
    • https://cdn.sqhk.co/finelega/fhchjbB/android_messages_phone_number_unknown.pdf
    • https://cdn.sqhk.co/vixukose/hhihY0K/datutuki.pdf
    • https://cdn.sqhk.co/wedegetuso/jfhcjco/94340274672.pdf
    • https://cdn.sqhk.co/lojumisebu/6gjcbYw/jump_rope_classes_melbourne.pdf
    • https://cdn.sqhk.co/vojazodelud/jg9NZhg/fastest_cars_under_25k_used.pdf
    • https://cdn.sqhk.co/kulabokirow/b5Cgege/fezikivo.pdf
    • https://cdn.sqhk.co/tabewinudeka/gbEgcha/wezelu.pdf
    • https://cdn.sqhk.co/texonatuzi/cKC8riC/furegezofomabakexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://moraruvotu.epizy.com/naligaxuboxifoni.pdf
    • https://s3.amazonaws.com/fakuguvil/friedrich_nietzsche_existentialism.pdf
    • http://vazorilumi.epizy.com/glencoe_geometry_chapter_10_quiz_answers.pdf
    • https://s3.amazonaws.com/juduk/how_to_use_utorrent_android_app.pdf
    • https://s3.amazonaws.com/sobaketemu/vba_activesheet._cells_format.pdf
    • https://s3.amazonaws.com/xilasisefi/food_website_templates_design.pdf
    • https://s3.amazonaws.com/lusabifef/should_you_watch_marvel_movies_in_order_of_release.pdf
    • https://s3.amazonaws.com/gimisorixosu/breuer_condensed_font.pdf
    • https://s3.amazonaws.com/mejobu/97266289402.pdf
    • https://s3.amazonaws.com/fizufapu/keno_je_toke_bengali_song_lyrics.pdf
    • https://s3.amazonaws.com/vidadaviwal/gafan.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_off0000e700.bin
38a887be4828d14cec654c96b2155c1f0c6e9a6ac1401c288fe4168fdfd33924		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 5276 bytes
font_01_sfnt_off0000f8ec.bin
8341a09082aee9433d712bd036d2a0eaeba760ab5eaab15c0105688556042a32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 11404 bytes

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