Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcea6cf22e09dfca…

MALICIOUS

PDF

84.1 KB Created: 2021-04-02 11:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbb00402dd30db9e247a7f05a06e1b1f SHA-1: 766310a3ff11ae3d0f7bc06f416718ab785960e7 SHA-256: bcea6cf22e09dfcab5b83b74d099cfbfde8cbaddfe19cce6caa448fc4a5a9295
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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-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://kuzutuzo.ru/wix?keyword=pathfinder+arcanist+archetypes
    • http://umkatrade.ru/54343529732disz3.pdf
    • http://pibarulajido.getenjoyment.net/antiterrorism_and_effective_death_penalty_act_of_1996.pdf
    • http://sugebowupubixo.mypressonline.com/machine_learning_stock_market.pdf
    • https://giravegide.weebly.com/uploads/1/3/2/6/132681237/jikuj_momekof_tadapunef_fukejesudab.pdf
    • http://help-ruleviolation.com/wagazupuk27n0g.pdf
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/1097647.pdf
    • http://hesap-al-sat.com/ramana_maharshi_ashram_bangalore5mjbu.pdf
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/tatokegorumu-gajorefi-kabipun-dufas.pdf
    • https://sagagedonu.weebly.com/uploads/1/3/4/0/134017332/xomase_pelawetarigo.pdf
    • https://nikakakuko.weebly.com/uploads/1/3/1/8/131871571/5614228.pdf
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/b6ad7b.pdf
    • https://texanajak.weebly.com/uploads/1/3/4/0/134018539/pizapep.pdf
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/xivatakeleda_modobimuvowepo_guxazuba_wuselaburotup.pdf
    • http://electriccannoz.club/brother_hl-l2360dw_drum_end_soon2t20n.pdf
    • http://randname.ru/how_install_vinyl_decalsdrddl.pdf
    • http://fionainthefield.org/zexevavudizomaxepufaxe630xm.pdf
    • http://lamisorosasam.mywebcommunity.org/weefim_assessment.pdf
    • http://mirror-x.org/christmas_santa_landing_runway_lights_unopenedqinef.pdf
    • http://daddytestit.xyz/4411782761pokme.pdf
    • https://nogeduju.weebly.com/uploads/1/3/1/3/131398368/680637.pdf
    • https://koverirenupoma.weebly.com/uploads/1/3/4/7/134747520/vedanax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_45200ad007954ff3bd4c067f30302333.pdf?index=true
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_42e5410c61c5442a828205718b55662f.pdf?index=true
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_632c5d142c7048cdb2926bb3f4fc070b.pdf?index=true
    • http://niwimugosaz.onlinewebshop.net/asciidoctorj_maven_plugin.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_6180dc00ab3e43b0a47b05de9844d4d0.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_off0000fbb6.bin
a8d1df195f4159cad9ac395cd5821e3412c201bab4037df0c3aecf60cd0b4343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 4992 bytes
font_01_sfnt_off00010ca1.bin
ea82f78607cf9a9f1e6dbc7fd7fe5729d04ae1bbfa5554780fddfd906b698504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 11240 bytes
font_02_sfnt_off000132ee.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132EE 4324 bytes

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