Malicious PDF — malware analysis report

Static analysis result for SHA-256 e589cae052a07baa…

MALICIOUS

PDF

93.7 KB Created: 2021-03-21 11:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfd2d6f948502609f237836d805041bd SHA-1: 113c31dda1a8179202e43f0250de4ced8ef86c0e SHA-256: e589cae052a07baa53dcaeaf1a1ff3f81232465770cf5003610361ac205926aa
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or redirection to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=amputation+ppt+pdf
    • https://cdn.sqhk.co/fagevibe/6pggGxC/dutarazuzajex.pdf
    • https://cdn.sqhk.co/zozimevoket/wjgjhhb/vujitizixunopuwilabujoj.pdf
    • https://lutavazakagege.weebly.com/uploads/1/3/1/3/131398084/lopulanani.pdf
    • https://cdn.sqhk.co/poronujefino/hfZYjRW/guzulususuxamujilejunun.pdf
    • http://lagidonak.mygamesonline.org/how_to_increase_arcane_power.pdf
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/9139073.pdf
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/risofajafaguva-magatuvev-togavom.pdf
    • https://cdn.sqhk.co/gojapawareke/ckbhfja/block_website_android_app.pdf
    • https://cdn.sqhk.co/rojogonezejo/n2Vgije/bichhoo_all_video_song.pdf
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/c2223339ebf.pdf
    • https://vudiwajexisipu.weebly.com/uploads/1/3/4/0/134096418/5080a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d2e81ea2-f34b-40e6-86d2-734733421315/97029840654.pdf
    • https://uploads.strikinglycdn.com/files/2dd817c1-b0ab-4815-880c-3a7975d2a7e7/nozarutobupipek.pdf
    • http://dezobod.onlinewebshop.net/garmin_gps_nuvi_2555lmt_manual.pdf
    • https://uploads.strikinglycdn.com/files/22864168-414e-487f-8a84-b0c93863b931/13091024256.pdf
    • https://uploads.strikinglycdn.com/files/76584099-0506-4328-ba57-10d4124cc0a4/how_to_program_kwikset_909.pdf
    • https://uploads.strikinglycdn.com/files/de3816ac-9556-4183-bc55-19bf61c59a42/un_monstruo_viene_a_verme_libro_personajes.pdf
    • https://uploads.strikinglycdn.com/files/c942585d-1bed-4479-adff-05857d5db5d7/life_skills_training_program_effectiveness.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_off0001312a.bin
571f1a76935047da7894c889b88cfcf1cf501012a277aada281fa8f314018828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1312A 4868 bytes
font_01_sfnt_off000141ab.bin
4cec219e354757025ab0b7baca97685026ca31aa86a9b4a957db20f6b26c1efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141AB 11892 bytes

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