Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e93b49b7e9b6c8…

MALICIOUS

PDF

82.4 KB Created: 2021-10-14 06:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: f8148437ea04c87722c8ce61f5a8378f SHA-1: 4b43ab24f6c7562c147bebb3563f357de3a80f28 SHA-256: 45e93b49b7e9b6c80b1d2e68b2d082e0034b71d101a42a5b74eab577c3c8271f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, one of which is hosted on disposable infrastructure. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may contain embedded JavaScript or exploit code to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://webursitet.org/Files/file/17151532291.pdf In PDF document text
    • https://yar-net.ru/userfiles/file/ripikigevetupodovoju.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5f9990fff918843b2038f7a5dd06e03e/82811467967.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/suxoluj.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/zijosutose.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/94569428278.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/nokupomitawinovu.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/wiviporazu.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/66245678278.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/16654506450.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154276e189f6---42755702963.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/numizitazegoluxebewi.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexuxejujusi.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/63384225400.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51667770216.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/34966012397.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/70159035472.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/zupusiligureromajega.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-10-4/20211004124731713853.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/finovegadedabomugupo.pdfIn PDF document text
    • https://miminku5.com/contents/files/rabedam.pdfIn PDF document text
    • http://3asoft.vn/img/files/vagivomux.pdfIn PDF document text
    • http://www.toptehnik.si/images/39707969731.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/lexegasokakovanapelivada.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/bolovozaze.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/29952383577.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=house+on+mango+street+publication+datePDF 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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 19296 bytes
SHA-256: 5f6d615e5cb3baceb076cbb6121dba3777a3f6ab98781fec69b6b8438a77dff6
font_01_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 11088 bytes
SHA-256: 3307c208c41a1692148586ce470d190423aed0014c8a322ba6e6256bf3d2fbe5
font_02_sfnt_off00012420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1