Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b92331f7611fe3d…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 18:27:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 231fa3f581295387cb4d7856e8acab67 SHA-1: 7ce146fdbfd38352e271173ef3aacd5776bffa39 SHA-256: 4b92331f7611fe3d2ab325180e06b302ab67fd190f3e0d675e22d209bd91c3c3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URL 'https://jacksth.ru/strik?utm_term=what+is+development+class+10th' is the primary indicator of compromise, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=what+is+development+class+10th
    • http://lagegisujego.iblogger.org/world_countries_and_capitals_in_tamil.pdf
    • https://cdn-cms.f-static.net/uploads/4420610/normal_601f1c2cd8109.pdf
    • https://cdn-cms.f-static.net/uploads/4454968/normal_6010cbf10dae1.pdf
    • https://static.s123-cdn-static.com/uploads/4421051/normal_60054b01bc655.pdf
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5fd2825c04dae.pdf
    • https://static.s123-cdn-static.com/uploads/4421983/normal_5fce6792432db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5f65c622-3d85-4400-a338-112edb9a30ff/what_video_formats_does_premiere_pro_support.pdf
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_e55dab96219f4388a22a0c31291e25ea.pdf?index=true
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_69f56710e8f94d56ab7173e79a56d4bd.pdf?index=true
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_a81f109d27eb412b9d023ea1fdb1d4e9.pdf?index=true
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_96286a956f6d4992a6cfa8e1ee5a9806.pdf?index=true
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_86c9f69ff47b4140861ff06a7480111b.pdf?index=true
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_7febae3feab34906b2b300e559c9b1d8.pdf?index=true
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_6cda541aa66a4118aef5a31331ccdb65.pdf?index=true
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_da81add7748848e1b9c4c55c8da1b329.pdf?index=true
    • http://vajukuke.rf.gd/xafobogalujadarujo.pdf
    • http://votitagupen.epizy.com/canales_de_distribucin_marketing.pdf
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_a34ac1bb3df24d0e917d08e97b43b530.pdf?index=true
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_9e5c64ee3f9b4360898cf41b6c771a76.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2595c171-65fb-4666-9d9c-76720408262c/bosch_tronic_3000_us7_electric_point-of-use_tankless_water_heater.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_off0000f0d6.bin
30193476a85e443f2dee18fc6e03f78e47af641bbb8abfafc97f7a50aa27a4b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 5484 bytes
font_01_sfnt_off00010372.bin
5fd95e33345bec77fb07dd241ca28bb0daecd6a5c9576073fd7155e17061c50f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 10960 bytes

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