Malicious PDF — malware analysis report

Static analysis result for SHA-256 9442782cc4e648b6…

MALICIOUS

PDF

70.2 KB Created: 2021-09-15 21:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37c3486cb2855db652db39ca7f28e52e SHA-1: 9cfbaeb612ee21155a0f4575f50354db6c0553d3 SHA-256: 9442782cc4e648b6417bd07504fc36110cd97012f456c5de46232c98a8a2dda5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically points to the document acting as a gateway to numerous other PDFs hosted on disposable domains. This suggests a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6055

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 http://media-production.net/admin/ckfinder/userfiles/files/woxozewuvudu.pdf In PDF document text
    • http://abwingsjanaf.com/uploads/files/14552733064.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/furatorofopogunekedivarox.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/65566933538.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/16474898178.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/devukapokomitonuzivigaxi.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/46861974625.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/dedumagodigana.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/wuwufafuxudivimilisabal.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/81489314397.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/bekalekuzemupozagozisav.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/86418209646.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/67910377632.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d1ba0185557f437fb4457678553f4ca/42765744134.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/36444700012.pdfIn PDF document text
    • https://iword.de/userfiles/file/61251272704.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/14893444339.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/dewined.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/74107494827.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/28824645775.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/satofujopanarugiwuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lock+screen+wallpaper+settings+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 10824 bytes
SHA-256: f69a874e280f071c6b8aee44da249218b3c30cfbea7c576c34cba9436a92e64f

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