Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e856c09a173047…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 17:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec531f6eac6aefb1fc01b2a01b33c423 SHA-1: 37c0a20dcf109311b5c65f50c30c863a69407431 SHA-256: b0e856c09a173047465ebf3a5a49abf5514a04749f61301999515442be6ae047
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is part of a malicious campaign, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6472

Heuristics 4

  • 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
  • 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://pistant.ru/uplcv?utm_term=ometv+video+chat+app+download PDF link annotation
    • http://kleinschaden-expert.com/userfiles/file/52165366731.pdfIn PDF document text
    • http://vodnik48.ru/content/file/95225434203.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/84444600751.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/22446730481.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/ruwewarimuwugivizomapugo.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/69597979283.pdfIn PDF document text
    • https://blogsma.com/files/92662187542.pdfIn PDF document text
    • http://digifast.cz/userfiles/25563750168.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/27145696821.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210919_AB60F52B9F8007F8.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090605575489.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86d702ca3---40210207244.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/midafekolawoni.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/25005976428.pdfIn PDF document text
    • http://4darchitecture.org/img/all/60743041015.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/wutomozezuwef.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/86549705495.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/51344732440.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/868794cf7f40ef0b430d2e10f6e020ce/zawazu.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/jaxokosefopekudikapu.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/99671452411.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/30701513510.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/sipivorasofa.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/lemujofim.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 10688 bytes
SHA-256: 9e2a78df16ed146430a8b7f23a9910dd2c4acb9f3c2d70a0b70b30027fba23de

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