Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdca17d90476d6d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 15:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf0dac693e1676bad3ef553c352816d1 SHA-1: 723c61b9f758f7650b18509a6de9357534895f90 SHA-256: 9bdca17d90476d6dee400be623641fb2d1e49bb5138717829dda1e0f3bfee627
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, with one notable example being http://mtreurope.com/ckfinder/userfiles/files/75708200910.pdf. Although no scripts were explicitly extracted, the PDF structure and the nature of the link farm suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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://mtreurope.com/ckfinder/userfiles/files/75708200910.pdf In PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/82501188700.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/nadisotejusisep.pdfIn PDF document text
    • https://ksboutlet.com/file/files/legosa.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/poxejuzugetorenijiloli.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/jilozil.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/27267999470.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/bugasasufazefo.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/89833873688.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/84995157992.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/57170610607.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/92133176591.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb75232a5---71161095349.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/9172651910.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/94031169275.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/71439402985.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98622031106.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/26701842768.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/99631581263.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/25040165918.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/34035591058.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/81211233590.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/wukonefuregososiralunafur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=punjabi+movies+2021+full+moviePDF 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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 18372 bytes
SHA-256: 7daa6a103d702bc3db60309b98744b0dff76231800e5b1c4d1f9510a08b5b9ac
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 10908 bytes
SHA-256: b623c4f8d8492d871f1406bbc6500a597005ebb99d6eee8d08f0e3a8af9855c7

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