Malicious PDF — malware analysis report

Static analysis result for SHA-256 929e7f09cc59a99b…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 07:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e0cb9764073be264325165d5ea9259f SHA-1: cb757920d330fbfe398aa16936292af6bac3fb0e SHA-256: 929e7f09cc59a99b61c93b39b1bb72ed110f2fb4edd14e5183a2009fce2e1485
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to direct the user to malicious external content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://oniceh.ru/uplcv?utm_term=audre+lorde+a+litany+for+survival PDF link annotation
    • https://studiecarriere.it/uploads/file/nopum.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/81828074452.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/40616203860.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/60840473742.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/rosupelolosuwu.pdfIn PDF document text
    • http://1472bond.com/upload/Fckeditor/file/84434573879.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/95cc12b67836bf463c27db51b827fb95/58185823262.pdfIn PDF document text
    • http://baoveantam.info/upload/files/kibabijip.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/25924133781.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/ponevadubijixunubeg.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/37779737395.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/59750975483.pdfIn PDF document text
    • https://esvigo.com/upload/files/61170640447.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161589f5012b7f---10833926927.pdfIn PDF document text
    • http://tyextractor.com/d/files/begonosevanusemeditafo.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/rofefuroduwozovoxewilebev.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/87239287200.pdfIn PDF document text
    • http://evola.it/userfiles/files/64071378307.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/mobes.pdfIn PDF document text
    • http://posuni.com/userfiles/file/16609020842.pdfIn PDF document text
    • http://marketingnews.fr/images/file/89601198958.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/38259101778.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://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_off0000aebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 10608 bytes
SHA-256: b50725d0ad88c2d2ef9298eabd772b367ec8214a430c00a40c1c6eb52da8d164
font_02_sfnt_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 17508 bytes
SHA-256: f569cf26af9988ebef6ce4058f9297d8eb6800687bee6f631c160ea7a7e9ddae

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