Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac8d239a61b7738…

MALICIOUS

PDF

88.6 KB Created: 2021-09-13 09:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e54adbf7f33d5f01d61e59ce320c5734 SHA-1: 0d861fd32ca516a6e65c3382e24e05b4b4fe5852 SHA-256: 5ac8d239a61b773880eb9de9c7223be413c144cfc1b97e12422a8f510df56390
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, such as http://indyskischool.com/ckfinder/userfiles/files/bekelamesev.pdf, likely lead to phishing or malware download sites. The PDF structure and the presence of embedded URLs suggest an attempt to trick users into visiting malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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 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 http://indyskischool.com/ckfinder/userfiles/files/bekelamesev.pdf In PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/sabuviwidamuvizad.pdfIn PDF document text
    • https://ahha.az/userfiles/file/88924760838.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/vijivujamereberazalutadi.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/nunubelanukarolaxobi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161392b053c73d---fuwalamedamifowe.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/16623777838.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/gugeduzowapuge.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/jakiwarubek.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/judaduzebex.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/jogefewalafabaxal.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/rovexa.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/gupeparivup.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/gexuwunux.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/rimelefadafimorupasevizu.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/barejul.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/92811004108.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/19868567395.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/13/55636290913.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/zuzafusegugitozidinamijub.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/5987054958.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b92c25a7fa---norojixujexonadiw.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/rafenoweroxapat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=black+panther+full+movie+online+watchPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 10976 bytes
SHA-256: d215c897f6ce80c796446e6542c8df72e470b3f95e5a36665e0adeb23f1d9c84
font_01_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 17628 bytes
SHA-256: 7ab993eb7e1798856ba2890b2fe12da1520094f9605be00faddefa4b25c6e828

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