Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90595993d1b7155…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 09:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7050f54c6559620c682ce9b5e194c297 SHA-1: 70cbef5f98131152be9a047fefa1a9b176e1c3e0 SHA-256: d90595993d1b71556614083a0e8bf7f090906f3b88fcc314f754a3bf8f3a8839
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially malicious domains, and is described as a link farm. The PDF structure and embedded content suggest an attempt to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614315aeea090---tumemer.pdf In PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/14211461003.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/depiworirubanoxugodinuje.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/turuz.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/87261439996.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/vomeribez.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210902110412_708135.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/12795766357.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/rutugoxupo.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/govimezonemenagunus.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/1159369735.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/dugabawekasigiwazebo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7e9048b030ef499cc489cbf0acb9780c/tolemipezo.pdfIn PDF document text
    • http://hydrem.ru/images/file/pigoju.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/24531636830.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/74012297652.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/tudurujo.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/kosawatarunavivi.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/50461118067.pdfIn PDF document text
    • http://www.centralperdana.com/file/43474036257.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/rebamobugetud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=e+myth+revisited+pdfPDF 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_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 10492 bytes
SHA-256: 4bfb34a24b1f9f6f18e1b795b234abeece9741f8850ea91d74ab650a92a56f67
font_02_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 17844 bytes
SHA-256: 74c60fedddbf82bc2905f02cefdf72f58a1610e5bbe5923f9eb27b68b16a63fd

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