Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d555fcc560f173…

MALICIOUS

PDF

83.7 KB Created: 2021-04-21 21:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2d1f744a75da0aa683504c4be043c298 SHA-1: 71a6fc9ac29befc55b295c8cfc94986025ab7da6 SHA-256: f7d555fcc560f173cdded1a8723e69ab4011b3dd3ad780c6ddc88196be527e02
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the presence of numerous URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+change+the+clock+on+a+pioneer+super+tuner+3d PDF link annotation
    • https://cdn.sqhk.co/jorawuge/hjgf5kY/moto_rider_3d_speed_highway_driving_apk.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/nemedogodefusot-nibagivokevuwon.pdfIn PDF document text
    • https://mitafewojoruwe.weebly.com/uploads/1/3/1/3/131381680/5405670.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/jamman_stereo_looper_solo_xt.pdfIn PDF document text
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/suxiwovalu-pasixijipuge-nikotiwobevinas.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/2720780.pdfIn PDF document text
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/fa17107ffab.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/genMheA/benozimukenomizewulemori.pdfIn PDF document text
    • https://puvojokuxika.weebly.com/uploads/1/3/5/9/135985507/e573ef7c8.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/SeupicE/getigusaxalemafe.pdfIn PDF document text
    • https://nakaleraba.weebly.com/uploads/1/3/4/6/134606700/625044.pdfIn PDF document text
    • https://furimubabo.weebly.com/uploads/1/3/1/8/131856330/766950.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/9hbgD1N/lajomusinibo.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/lelikozipax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/divikufifir/viwus.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/25332201479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8dce2cb-7635-41da-8e42-33815f428be9/duravuku.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/ketuturusozevap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78078307-5cd1-45da-9b19-2762359c6ad5/17298872858.pdfIn PDF document text
    • http://vumovofun.onlinewebshop.net/balzac_and_the_little_chinese_seamstress_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb4f919-f0ac-409f-99a8-ba282b5f74f2/a_series_of_unfortunate_events_cast_season_3_frank_and_ernest.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/zijifevidavizuriru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0cfe1e0-ee9a-439f-8965-5f0ab7ed7981/schwinn_meridian_electric_trike.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/stihl_saw_ts400_belt.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_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 5616 bytes
SHA-256: cb8d6a43c962a107dc051bea277b0e7c246881808d43eace8d1531a1d78f9d8b
font_01_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 11200 bytes
SHA-256: 750d8e13008e40c3963f0e0ab4a87e2e6e5b6ba5aa209e2ff60dd778137ffe7a

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