Malicious PDF — malware analysis report

Static analysis result for SHA-256 5550b871bb53a54e…

MALICIOUS

PDF

74.1 KB Created: 2021-03-30 20:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e58bd05e0ab19f110671c50131995ee8 SHA-1: 593f0b92595cc5c13c3ebe7d38dbb51071222b62 SHA-256: 5550b871bb53a54e7a8f2b6f1a1ea7b7b5f3781069be39459aa950936e2749b4
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristic detections indicating malicious intent, specifically related to phishing. The document body, though heavily obfuscated, suggests a lure for free software downloads, which is a common tactic for distributing malware. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/award?keyword=pdf+acrobat+reader+free+download+for+windows+7
    • https://cdn.sqhk.co/roratumopiv/gdagdjj/do_crows_eat_eggshells.pdf
    • https://cdn.sqhk.co/xagegegozi/ihciagg/wibawagodelewedeju.pdf
    • https://cdn.sqhk.co/dexasubu/dahahcA/ranev.pdf
    • https://cdn.sqhk.co/xomorenut/0mGhegf/boruxarefebuvifoz.pdf
    • http://budokudepa.scienceontheweb.net/geometric_mean_theorem_worksheet.pdf
    • https://cdn.sqhk.co/vadezewe/eDjeokd/87994512543.pdf
    • http://mejumeroxara.mywebcommunity.org/fomekube.pdf
    • https://cdn.sqhk.co/xinulezebi/eAjbHib/57928685588.pdf
    • https://cdn.sqhk.co/dukosisevu/ddji3if/winter_white_russian_dwarf_hamster_lifespan.pdf
    • http://jologedeb.getenjoyment.net/antioxidants_and_reactive_oxygen_species_in_plants.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fodapimogu.rf.gd/54262487022.pdf
    • http://repibikapowa.epizy.com/voxozak.pdf
    • http://rokumezex.epizy.com/toxogusexetedileju.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/fish_eat_fish_3_players_guide.pdf
    • https://s3.amazonaws.com/zulezov/rafutunewuxuxuzewoxerulu.pdf
    • https://s3.amazonaws.com/wegugus/72723431165.pdf
    • http://tinipemalab.rf.gd/jardin_l_encyclopdie.pdf
    • http://wupafar.rf.gd/meal_plan_template_free.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_off0000e3d3.bin
03311a8fbe982b3b27b09100cf8781e45820963ea7aab78f6b34797caa0db77b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 5328 bytes
font_01_sfnt_off0000f61e.bin
b796eaa5e99bc70d3ba14aeddd7139c41c95a1ea7d5c2b30b38b61593f5c805e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 10824 bytes

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