Malicious PDF — malware analysis report

Static analysis result for SHA-256 76766d1843e2f3d2…

MALICIOUS

PDF

84.0 KB Created: 2021-03-17 14:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2826515a75b70453c627d2bf509b35a9 SHA-1: 9de264e07c6b9b625737fdc06eb80f2ef69c7ec4 SHA-256: 76766d1843e2f3d2a373fa7149403b7f8263690990cd61dc0177692bbebae516
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, suggests a lure related to 'polynomial inequalities solver'. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to direct users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=polynomial+inequalities+solver
    • http://helplnstagramcontact5087423.com/how_often_to_change_transmission_fluid_ford_explorer33zfl.pdf
    • https://static.s123-cdn-static.com/uploads/4391920/normal_600733a4cc56c.pdf
    • https://cdn-cms.f-static.net/uploads/4408701/normal_603e40099ed29.pdf
    • https://wevumofanefaso.weebly.com/uploads/1/3/5/9/135964816/e8816d36faec.pdf
    • http://complerbnp.com/14_gauge_stainless_steel_sheet_metal_thickness8lrp8.pdf
    • http://todayit.pro/blackwidow_keyboard_not_showing_up_in_synapselkk3s.pdf
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/1071951.pdf
    • https://zatenumidepav.weebly.com/uploads/1/3/0/7/130776458/5785820.pdf
    • http://micrometerdigital.xyz/dell_2001fp_ultrasharp_20_lcd_monitor2s668.pdf
    • http://souve.me/4701852985t7a4z.pdf
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/8472443.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_9f56e389befa4b5998c0fe92304cac83.pdf?index=true
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_0b393cfc0642491eb5be695c54d6811f.pdf?index=true
    • https://s3.amazonaws.com/tidigudetefumof/buvobijafagigikowix.pdf
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_ced9cec181994a2996f4acf5c87a50c8.pdf?index=true
    • https://s3.amazonaws.com/mamukawaxatali/31207280088.pdf
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_ea1df604e2c7420ca8009bb2fcc150c7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/af98b67a-63d1-4a4c-894d-9f5b9fb77925/rijezerofatoxino.pdf
    • https://uploads.strikinglycdn.com/files/847163f8-9b0b-4db7-9031-f8fbb702fc47/mods_mapas_brasileiros_farming_simulator_2015.pdf
    • https://s3.amazonaws.com/nuxulikiwab/pema_chodron_tonglen.pdf
    • https://s3.amazonaws.com/lixuduwonifa/false_inquiries_credit_report.pdf
    • https://uploads.strikinglycdn.com/files/ddda96e2-d20a-4b52-8b6a-b1afc4be7d99/cub_cadet_lt1050_drive_belt_diagram.pdf
    • https://uploads.strikinglycdn.com/files/c30369c4-8829-4703-8566-ae395e6ba292/68300940624.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f4.bin
98f0d4d8eea898bd451c190f5235eebc925473d546002e4ea9bf0c34dd1b34e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 5120 bytes
font_01_sfnt_off00010858.bin
6ae104c53a5edd9ba3f830117fca9b12681febe95ba51062eedfcd5a361e46f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 10648 bytes
font_02_sfnt_off00012cce.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 16204 bytes

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