Malicious PDF — malware analysis report

Static analysis result for SHA-256 b432c5c9341c9bf3…

MALICIOUS

PDF

77.4 KB Created: 2021-06-03 02:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ea071bd1191470ed844f9822ede7fcc SHA-1: 050dae7c2990d47e6589c355168700d51c2b6b7f SHA-256: b432c5c9341c9bf35f459c563ba4d3291e8bc13a860cd130af4b211cdadd9487
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or personal web hosting platforms, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/123?utm_term=quadrilateral+reference+sheet+pdf
    • https://lirajibabu.weebly.com/uploads/1/3/4/6/134635624/6b8b7.pdf
    • https://cdn-cms.f-static.net/uploads/4476564/normal_6037116f802fe.pdf
    • https://static.s123-cdn-static.com/uploads/4427781/normal_5fcd42bd7ca82.pdf
    • https://cdn-cms.f-static.net/uploads/4450242/normal_6042f42aa8c7e.pdf
    • https://tidijutaxidekoz.weebly.com/uploads/1/3/4/5/134589823/xinolox-xabovito-nibisel.pdf
    • https://cdn-cms.f-static.net/uploads/4475729/normal_603fef1e26d2f.pdf
    • https://cdn-cms.f-static.net/uploads/4410695/normal_6050f28195459.pdf
    • https://cdn-cms.f-static.net/uploads/4501804/normal_6027d77676e3d.pdf
    • https://piziruzebizopu.weebly.com/uploads/1/3/4/3/134350425/eca11c4227.pdf
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/3ba5bc857980c2.pdf
    • https://bekawoxe.weebly.com/uploads/1/3/4/5/134529307/luwox.pdf
    • https://cdn-cms.f-static.net/uploads/4461481/normal_6022a86481f1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0d428352-42bf-4c29-9b6f-77741227a20f/the_scarlet_pimpernel_actors.pdf
    • http://wuwazilizos.pbworks.com/w/file/fetch/144424389/bosch_ts3000_specs.pdf
    • http://zixereves.pbworks.com/f/descargar_crash_bandicoot_2_para_android_apk.pdf
    • https://uploads.strikinglycdn.com/files/241de196-3dda-432f-b309-f65c54c5c2f4/68850245947.pdf
    • https://uploads.strikinglycdn.com/files/5dc00d79-0a66-4e24-9a5f-db6a62d7ee2b/fisher_and_paykel_dishwasher_fault_code_e30.pdf
    • https://uploads.strikinglycdn.com/files/383dde7c-d720-4213-8879-bee68cf487df/how_to_interpret_scl-90-r.pdf
    • https://uploads.strikinglycdn.com/files/dd1cb5ae-e0f1-4ebc-a027-d80cf8db956a/never_back_down_2008_full_movie_free_download_in_hindi_hd.pdf
    • http://togiwuvoze.pbworks.com/f/travail_et_energie_interne_exercices_corrigs_1_bac.pdf
    • https://uploads.strikinglycdn.com/files/839156e9-ed82-49ec-9694-21fca621f1d2/degamedez.pdf
    • http://gatunam.pbworks.com/f/66835696320.pdf
    • http://kakewizajupe.pbworks.com/w/file/fetch/144532623/graphing_systems_of_linear_equations_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/0a47b8f5-17f5-4b45-b878-4170ac25a090/59109338857.pdf
    • https://uploads.strikinglycdn.com/files/99fadc14-9d3b-4525-97a7-ece462c25dce/damubodelunabu.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_off0000ef71.bin
724601617a99fd458b4fdfc98cb044bc1f27d7cc7f6c93000e1ab7abf97156fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 5304 bytes
font_01_sfnt_off00010175.bin
6a3410dc55ea6160cadefe1af413601be43630cc0d6ed81c49cb820306407b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 11556 bytes

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