Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4906c44874ef89…

MALICIOUS

PDF

81.3 KB Created: 2021-03-18 10:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73d65d55757721fc4123b7929c96a9c1 SHA-1: 770cd94d5eef5b784da631cb9266cd3ca9f89ec2 SHA-256: fa4906c44874ef8926196c4b2f19245452477293c8985cd052ba432c023dc490
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 URI pointing to 'pelibifir.ru', which is likely a malicious domain used to host phishing content or distribute further malware. The document body, though heavily obfuscated, contains references to 'free online architecture drawing tools', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=free+online+architecture+drawing+tools
    • https://cdn-cms.f-static.net/uploads/4468540/normal_5fd2c384c40ec.pdf
    • http://vatidenow.medianewsonline.com/bienaventuranzas_significado_de_cada_una.pdf
    • https://cdn.sqhk.co/sedazozesufu/jhhbRKG/video_player_hd_app.pdf
    • http://domobifotuza.sportsontheweb.net/barron_s_sat_subject_test_physics_free.pdf
    • http://cz-nitrof.website/samsung_aqua_jet_vrt_smart_care_washer_parts06iu6.pdf
    • https://cdn.sqhk.co/gutinisiv/hEjXBO2/vanilla_sponge_cake_recipe_with_cake_flour.pdf
    • https://static.s123-cdn-static.com/uploads/4468267/normal_5fcf8af7abc39.pdf
    • http://delozofize.scienceontheweb.net/jepajigesa.pdf
    • https://cdn.sqhk.co/seworani/igpsijc/87357932944.pdf
    • https://static.s123-cdn-static.com/uploads/4486206/normal_600529a888dd7.pdf
    • http://copyrightsafetyhelps.com/fafuzosexojejolcpirw.pdf
    • https://cdn.sqhk.co/kogewole/h1ifmhe/13828839554.pdf
    • https://cdn-cms.f-static.net/uploads/4495254/normal_6046e305749a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_1d798dd0df6a4125b62475978e71b378.pdf?index=true
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_8908fd7aec924209a100fa86106d1736.pdf?index=true
    • https://s3.amazonaws.com/lekelepowo/articulatory_phonetics_gick.pdf
    • http://dijipola.onlinewebshop.net/metal_forming_analysis_book.pdf
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_7cde1137929c46be823f3bec16d39ab6.pdf?index=true
    • https://s3.amazonaws.com/padanivozeb/livifasemobawofapunom.pdf
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_153561d3e23343c4a87baa7901ecd22b.pdf?index=true
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_ebc5a5714913417b8eaa7d3fd9d5f612.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4be.bin
f4a3ca49a8ee89e746174b9d0e62906ef06619d5b64531c5a1e9c89df0bd98b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 5132 bytes
font_01_sfnt_off0001063c.bin
b855f393114e6989351d84c335d10b9df7eb3f25d5898a94916922f7186bc8f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 10424 bytes
font_02_sfnt_off000129a5.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A5 4324 bytes

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