Malicious PDF — malware analysis report

Static analysis result for SHA-256 a728af8ba0a66e86…

MALICIOUS

PDF

83.3 KB Created: 2021-06-13 01:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f59a96f32214fc5edc1eaefef18fcc SHA-1: 2d1759fc1a6c2d8814ffc452fd7857652a76cf14 SHA-256: a728af8ba0a66e86485e4a7c1526364278ecc4459ec411ec9b6e4cf522e012c5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or phishing campaigns to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful content.

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-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://medvor.ru/pbw?utm_term=dnd+5e+dungeons
    • https://zodiniligi.weebly.com/uploads/1/3/7/5/137509719/ab10f1a6efd6.pdf
    • https://static.s123-cdn-static.com/uploads/4463565/normal_5ff5b4289f6c0.pdf
    • https://static.s123-cdn-static.com/uploads/4454182/normal_5ff13ecb0148e.pdf
    • https://wiwasowabomas.weebly.com/uploads/1/3/4/8/134858473/pitivatorumej_rowutelidajuf_renifuwudawi_nuwinanimunisek.pdf
    • https://kodidenub.weebly.com/uploads/1/3/4/3/134328035/ee44227.pdf
    • https://cdn-cms.f-static.net/uploads/4466153/normal_606229c28c5a8.pdf
    • https://cdn-cms.f-static.net/uploads/4481056/normal_5fe616729cef6.pdf
    • https://cdn-cms.f-static.net/uploads/4498702/normal_6013253716986.pdf
    • https://zodosixuwe.weebly.com/uploads/1/3/4/8/134863902/bekusewenejubetamaf.pdf
    • https://burerekubexu.weebly.com/uploads/1/3/1/3/131381452/vujetomuraruxe.pdf
    • https://cdn-cms.f-static.net/uploads/4370072/normal_60c321ffeda54.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dea6a4ec-b74c-42ab-98f1-a053e81b1e0a/simple_scenery_drawing_pencil.pdf
    • https://uploads.strikinglycdn.com/files/2a869abf-a54d-4bd9-a5f5-474f9a031dcb/pubakojojiravavasubun.pdf
    • https://uploads.strikinglycdn.com/files/cc3d8e2a-4533-4242-a996-0d453fb4f847/bubetidovenemopuj.pdf
    • https://uploads.strikinglycdn.com/files/e77af85e-448d-4260-819b-3384db768daa/the_lion_king_2019_full_movie_english_subtitles_download.pdf
    • http://vikiruji.pbworks.com/f/game_ae_mysteries.pdf
    • https://uploads.strikinglycdn.com/files/29f21043-21e7-4ab2-b1c5-1cdea9f0599b/44682766251.pdf
    • http://neruwuk.pbworks.com/f/let_it_shine_full_movie_free_download.pdf
    • https://uploads.strikinglycdn.com/files/d59eb0dc-0fbd-4ceb-8acc-fded633f90a8/21314926517.pdf
    • https://uploads.strikinglycdn.com/files/0596c8ac-9894-4ac8-a24e-1d7a46255b1a/sawosagagev.pdf
    • https://uploads.strikinglycdn.com/files/2f26bb1c-1d28-48c4-b700-109cfc2185bc/56690314905.pdf
    • https://uploads.strikinglycdn.com/files/40fb17f5-2d6a-4933-a7cd-e36cd1702594/lock_up_herbicide.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_off00010966.bin
1e801448f7399f2b645c36706f8d6456f091f92c172ccf99979baf40b35acef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 4780 bytes
font_01_sfnt_off000119c5.bin
34e1139b5aded3b58d3667156f87d35a3dba484b24d1dedb8498bdd5d57cbcaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C5 11544 bytes

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