Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac87a56bfe7e53b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 04:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08fa2aaea8aec80671dba7e78197471e SHA-1: 9330d3de32fc39f3c03f1a058518f1a08f9a9aa2 SHA-256: 7ac87a56bfe7e53b28dce56537c176f312097e5e71268375ed305d1d0ac8a6b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests an attempt to obscure the true destination or distribute multiple malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pmms-online.com/assets/file/noliledimanowibegadera.pdf In PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/wupiro.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/59255634570.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/81869504422.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/zibulapegorekobivapeva.pdfIn PDF document text
    • http://wami.cc/data/files/koxabamuxanaxevexeworabe.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/13468825338.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/munudanowitunode.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/29705704062.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/lemuledetawurog.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/47363821273.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/rakijov.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/50704844017.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/sotivebezikore.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b08590cdd---zatulawipizorogu.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/84422519295.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/68070166024.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/16127782151.pdfIn PDF document text
    • http://aromata.ru/upload/files/dokevefedixote.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323c1b106a8---pizupopepubukular.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/vabunirikiz.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/vapagutipunufatezevuko.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/faralixilima.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/56058618511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=usb+tethering+pc+to+mobilePDF 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_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 17780 bytes
SHA-256: 154c51ee0f461a2e237a8f9a096c6dd80574eb1c9b08017b8c6b3004b6ac7cfa
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 10804 bytes
SHA-256: 9baa0daf37561119cce0a731a5dec73aa2643ba665f3e7a3ad7a4ef9a305f841

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