Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e278f199932d39…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 18:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9aec39b4cf9e51f8e9a379c5805442f8 SHA-1: ce3436e8846bbdd26e9bc7d054b0c0975ec53a89 SHA-256: 08e278f199932d3999b325233010f8f3370c15a4b61aeae24b662abd1041610d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to trick users into visiting compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://drafthe.ru/uplcv?utm_term=local+adb+shell+apk+free+download PDF link annotation
    • https://sharedsynergy.com/userfiles/file/61215854304.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/34482770115.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090315242573499.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/22562124926.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vupotemaf.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/zitoketitadovejeriregiso.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/31789688500.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/ronisaxujaz.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/taronejuxarovizodanudan.pdfIn PDF document text
    • https://kaparatt.com/images/File/86000284194.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/zetove.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///vavebelotulagusamofow.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/nelokupigerokone.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/kuvelinukekopusirixaxit.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210905190621.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c69b3d6044---kevune.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/57137619621.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/28109494299.pdfIn PDF document text
    • http://ahchala.com/img/file/betuzumo.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/20709349172.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/74035668367.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/bipeguxijira.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/natotofesijesa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614129b44eef2---54072708769.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_off0000aee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE6 15676 bytes
SHA-256: ace5b2ad541286f51cd8873bd596b03bec6cb23ece391f1a4fcb4171cb3efc19
font_01_sfnt_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 10804 bytes
SHA-256: be6a3dcd6a92df8ad2786c69745e298b8612c4032a0683d0c33b32fab5767156
font_02_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1