Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31bc52766c2f88f…

MALICIOUS

PDF

75.0 KB Created: 2021-03-26 07:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe1d15892633c9779c5e5b7edc78323a SHA-1: eab77131a49edc713b904c68086a7cb50ba13a42 SHA-256: a31bc52766c2f88f875a6b2089c5cdaf175b4d8c040f3917e04bc46d58dd028f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'kuzutuzo.ru', suggesting it's designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains keywords related to 'maintenance fee' and 'wkhtmltopdf', hinting at a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=hsa+no+maintenance+fee
    • http://kaxiwex.iblogger.org/close_reading_worksheets_for_3rd_grade.pdf
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5fc66e5e4335c.pdf
    • https://static.s123-cdn-static.com/uploads/4480732/normal_5ff9b6f3e46e4.pdf
    • http://sugakibabusu.scienceontheweb.net/irrigation_engineering_by_basak_free_download.pdf
    • http://gepexoliv.medianewsonline.com/how_deep_is_lake_worth.pdf
    • http://jakusavu.sportsontheweb.net/bosozizofimitopaj.pdf
    • http://dazomasuw.22web.org/34972577305.pdf
    • http://lozipazom.sportsontheweb.net/how_much_is_apple_tv_3rd_generation_worth.pdf
    • https://cdn-cms.f-static.net/uploads/4374181/normal_601a124578892.pdf
    • http://kiwenalod.medianewsonline.com/how_to_set_g_shock_ga_110.pdf
    • http://tixesikixux.mygamesonline.org/econometrics_journal.pdf
    • http://nifimoperokoj.medianewsonline.com/advanced_muscle_gain_workout_plan.pdf
    • http://kelimap.mywebcommunity.org/do_hiccups_make_your_heart_stop.pdf
    • https://cdn-cms.f-static.net/uploads/4446915/normal_604d3dbea1569.pdf
    • https://static.s123-cdn-static.com/uploads/4416301/normal_5fe58645aa94d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://reditavipesef.rf.gd/my_ryobi_pressure_washer_keeps_shutting_off.pdf
    • http://xifeloj.onlinewebshop.net/calories_for_taco_bell_soft_taco.pdf
    • http://joberemig.atwebpages.com/carb_free_food_list.pdf
    • https://s3.amazonaws.com/nutanigonu/captain_america_4k_hd_wallpaper.pdf
    • https://s3.amazonaws.com/zifilobesumafi/99147889666.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/boss_chromatic_tuner_tu-10_instructions.pdf
    • http://zovuzizosagedip.epizy.com/thng_t_23_2020_tt_bltbxh.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_off0000e8ba.bin
4199df6c0af19ea0f19f340453710323821de77963fcced61a335b5eae019a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 4860 bytes
font_01_sfnt_off0000f933.bin
839d157544a2b1b92c20745eb69c40fc6c97432ff31600285a1e5bc903e4f102		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 11332 bytes

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