Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d91136759fd7973…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 01:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81ce37b0598a2a759ea244aea765b7e7 SHA-1: 3cfca0799825d7c0952207a0876072815dc44f98 SHA-256: 1d91136759fd79732c297f7cc7450e564b82e138995b09d21e24b2f9eef510b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://infrive.ru/uplcv?utm_term=cara+install+game+psp PDF link annotation
    • https://pachetedeturism.ro/images/files/nusikejad.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/66914895241.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/6051136270.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a232b6008---zijizilitumu.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/28239758998.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/lewatidexasev.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/94465483680.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090913001073499.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/70597593868.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/88081007690.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/zediv.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/xazejarisogedimifese.pdfIn PDF document text
    • http://zubrcup.by/files/files/dugugezopo.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/bebow.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/pefopekiwebodigukuditunis.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/poton.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/74044395075.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/43298693458.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/bizoguwexa.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/509895e17b5cd30c39cb39748219ee75/jezunoje.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/mijajedeliwewazunanip.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/68447132842.pdfIn PDF document text
    • http://klenderbio.com/upload/files/podofiluberivi.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_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 17068 bytes
SHA-256: f2b0e427d37746b5601f5b2cff4dc94217822de283db1e0d298be43a537e0e73
font_01_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 10508 bytes
SHA-256: ebadbbe15fd406a267f742cb5df00a1295faefbe40b4cfbcb3ca288667284ac5
font_02_sfnt_off000117a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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