Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb07d5808c590d8…

MALICIOUS

PDF

66.3 KB Created: 2021-09-23 04:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 51602ca7e8261cdafa6b4197f546cbe2 SHA-1: c35bd35761ffc983e33ba1512ac85e71fb779bea SHA-256: 8bb07d5808c590d81a914cc9d6e01a78297838135b38b44455c70ca6fecb94a9
124 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

Heuristics 4

  • 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
  • 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://laborke.ru/uplcv?utm_term=iphone+emoji+for+android PDF link annotation
    • http://yuc-fac.com/uploadfiles/20210921110242.pdfIn PDF document text
    • https://www.colegiumaniucarei.ro/ckfinder/userfiles/files/lefebajinaxowotoxenan.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/kobivovazolajebo.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/15267425308.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/92698748583.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/xazagubu.pdfIn PDF document text
    • http://ustunongel.com/image/files/xerivibasusumebilevuwijuk.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/lisuvupivuwo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb13dbfbf---mojerelunodamekawikidu.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/82059821640.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210920_64DC5D99EF2DDA40.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/kebodumolomiku.pdfIn PDF document text
    • https://endobible.com/userfiles/file/60230604820.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/43650287541.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/94757589471.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/ruwodi.pdfIn PDF document text
    • http://mdtrend.hu/files/file/ruselovanapenurixojina.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/21675439581.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/95064062289.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/87879882172.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/vinikasa.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/89658493092.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b1106b026---vexefedekujuxufef.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/95493660525.pdfIn PDF document text
    • 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_off0000d0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 10532 bytes
SHA-256: 948715bb00f1c2a3676415d72d162f624669b54d96ab1f9eda19908a8b8f254f

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