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) First seen: 2026-06-04
MD5: 231fa3f581295387cb4d7856e8acab67 SHA-1: 7ce146fdbfd38352e271173ef3aacd5776bffa39 SHA-256: 4b92331f7611fe3d2ab325180e06b302ab67fd190f3e0d675e22d209bd91c3c3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score support the classification as malicious, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 PDF link annotation
    • http://lagegisujego.iblogger.org/world_countries_and_capitals_in_tamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_601f1c2cd8109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_6010cbf10dae1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421051/normal_60054b01bc655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5fd2825c04dae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421983/normal_5fce6792432db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f65c622-3d85-4400-a338-112edb9a30ff/what_video_formats_does_premiere_pro_support.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_e55dab96219f4388a22a0c31291e25ea.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_69f56710e8f94d56ab7173e79a56d4bd.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_a81f109d27eb412b9d023ea1fdb1d4e9.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_96286a956f6d4992a6cfa8e1ee5a9806.pdf?index=trueIn PDF document text
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_86c9f69ff47b4140861ff06a7480111b.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_7febae3feab34906b2b300e559c9b1d8.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_6cda541aa66a4118aef5a31331ccdb65.pdf?index=trueIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_da81add7748848e1b9c4c55c8da1b329.pdf?index=trueIn PDF document text
    • http://vajukuke.rf.gd/xafobogalujadarujo.pdfIn PDF document text
    • http://votitagupen.epizy.com/canales_de_distribucin_marketing.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_a34ac1bb3df24d0e917d08e97b43b530.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_9e5c64ee3f9b4360898cf41b6c771a76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2595c171-65fb-4666-9d9c-76720408262c/bosch_tronic_3000_us7_electric_point-of-use_tankless_water_heater.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 5484 bytes
SHA-256: 30193476a85e443f2dee18fc6e03f78e47af641bbb8abfafc97f7a50aa27a4b0
font_01_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 10960 bytes
SHA-256: 5fd95e33345bec77fb07dd241ca28bb0daecd6a5c9576073fd7155e17061c50f