Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f4934326e1c220…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 07:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ba4685ede9d971f0fcc41afb3dfc2588 SHA-1: 60eb798e7a07b2dba661f0b2b586c6a15182907a SHA-256: 47f4934326e1c2201e3d5810880a8279e74f55d35d9be79ab9d3dade3d23eda0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan PDF. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=how+to+recover+deleted+photos+in+internal+storage PDF link annotation
    • http://stauarchitetti.eu/userfiles/files/67495691449.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/kuwopilufukelexedan.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/mavubogavovem.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/bexoboj.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/24727793263.pdfIn PDF document text
    • http://askaudit.ru/price/5212503272.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/nedetubax.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/48558362130.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/39684165757.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091805071173499.pdfIn PDF document text
    • http://na3.it/misc/file/22914104842.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/88034221257.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/tibasomurakoto.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/wofavetakiwubimabi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc43798b65742f1ade8c1927f78df2dd/75703420150.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/39371784688.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/6188580956.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/21811907041.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/metojokamep.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/55598441017.pdfIn PDF document text
    • http://esejsc.com/upload/files/senudiwuxolijizodaso.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238c3a96fb---gekaranadiremekogig.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc172b73c---torojagelaliw.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/nopufezosokil.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_off0000bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA0 10936 bytes
SHA-256: 8109d4185f26f10b168eead01b52fab8e4a9e759b23d5c9306326fd6996f30aa
font_01_sfnt_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 17580 bytes
SHA-256: 4c36a4cbf537848524c3dc49067e5ec0dcdf2a4e7c9bdf015c270ca656e4593e