Malicious PDF — malware analysis report

Static analysis result for SHA-256 de41179019f54dd7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 09:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45e588e02e2bc64b9cc4b3fb99f899f7 SHA-1: c38e0e0e15c042ffa42ff9549581d5d87fdb10ab SHA-256: de41179019f54dd70c745615f65e861fd717e4bef844d3cef309211ba26d7674
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. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://duszek-lasu.pl/userfiles/file/fuvagaxabuxofarabogivat.pdf In PDF document text
    • http://ohdiabo.net/images/ckeditor/files/87167896313.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/30396341191.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/44597756080.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/sarapofisomelave.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/54802152195.pdfIn PDF document text
    • http://rinsacars.com/files/others/63242802081.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/170946948561330356caad2.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/12449500781.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/veribijadirif.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/32104201133.pdfIn PDF document text
    • http://i-physiology.ru/upload/36467325769.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/rupivuxunovagunuta.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/43751165197.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/wosazedolixevita.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210907_091442.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/9542937680.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/razosep.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210917_9BBD8B21DBC09ED0.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e919e49a---80794293377.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/86150309314.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/39571991614.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/95750295152.pdfIn PDF document text
    • http://dhf-china.com/d/files/46511220521.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/60860398532.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3909e59e2177c0e3b35f21a3f2b5e090/jisurejodifereboki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=top+sport+apkPDF 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_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 9928 bytes
SHA-256: 73b3b098f33869ec53a109737e3b41aae43818301cede837114c7a5441af36c8
font_01_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 18328 bytes
SHA-256: b73b4cbf65dc58a97c3e7bc78f01928e48b005ac7d05cbf4838cd334e74a80f1
font_02_sfnt_off0001246c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1