Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df5e146067a6359…

MALICIOUS

PDF

80.3 KB Created: 2021-03-18 15:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d095b231d7535014575e3e7ecdcaf08 SHA-1: 2e4b9439aa3f702561fd341e6f8fd5b1e6506e2e SHA-256: 7df5e146067a63597203e6a8a8ff1f94f36810c57a884f2ed464bcbef89cd89c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick users into installing a browser extension or update. An external URI was also found pointing to a suspicious domain, likely part of the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jacksth.ru/strik?utm_term=how+zotero+works
    • http://kofodotig.sportsontheweb.net/tozawolowuta.pdf
    • https://cdn-cms.f-static.net/uploads/4413374/normal_601e8517d7c29.pdf
    • https://cdn.sqhk.co/zapusukajev/O6mjiyT/translation_rotation_reflection_worksheet_10th_grade.pdf
    • https://fefufivakelazi.weebly.com/uploads/1/3/0/7/130739222/begogu_welaf.pdf
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/pililoxutiru.pdf
    • https://cdn-cms.f-static.net/uploads/4408187/normal_6030dab877a7c.pdf
    • http://pazujiz.mygamesonline.org/lewepudepulu.pdf
    • http://tuzogat.sportsontheweb.net/how_to_start_my_karcher_pressure_washer_k4.pdf
    • https://cdn.sqhk.co/wekaradukuve/Tbm9Jhh/wafilojaledaxenuka.pdf
    • https://static.s123-cdn-static.com/uploads/4455894/normal_5fcb497cd3521.pdf
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/9291521.pdf
    • https://cdn.sqhk.co/pagozixupezi/7hajijL/dagulexut.pdf
    • https://cdn-cms.f-static.net/uploads/4375356/normal_60168b3873032.pdf
    • http://mopowataxix.medianewsonline.com/nidubusaxekoxixu.pdf
    • https://cdn.sqhk.co/gawagunikuw/8Cc2caz/happier_to_give_instagram.pdf
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/b2d000db284bf.pdf
    • https://static.s123-cdn-static.com/uploads/4424933/normal_5ffe6ce4e71fc.pdf
    • http://mudixefibewab.mywebcommunity.org/67874168767.pdf
    • https://cdn.sqhk.co/sadirorig/hiphdV3/jetatulukakowewerafimofaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_783cb2ca57be4a828e706307e3bd85e4.pdf?index=true
    • https://s3.amazonaws.com/bufipevuril/3041835016.pdf
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_7e08050d91cf464d957c725ad8804e2c.pdf?index=true
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_f3809c6e2df34f5586e99ec710015443.pdf?index=true
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_f0f096e2630749db8dd97d5b1a7bc45e.pdf?index=true
    • https://s3.amazonaws.com/petuzutemixuvod/78863848447.pdf
    • https://s3.amazonaws.com/lumixi/como_se_llena_un_carta_poder.pdf
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_0980828a7ee243fbafd981affa6f62ed.pdf?index=true
    • 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_off0000fea5.bin
68b6c0d4a81801066a3b9e047a2ffb05ad33cd95de4d30f1f2d7bbbab53ef05b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 4604 bytes
font_01_sfnt_off00010e78.bin
e01a6ea9f5f3a839b97ea7119a165a4114a222e82f462da544d1d20da8db36f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 10920 bytes

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