Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e2fd0351db70e4…

MALICIOUS

PDF

62.3 KB Created: 2021-03-02 00:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 81637be6a334553d04b3d0889c5757a5 SHA-1: b4cc6dbb75b6200b8cd51e9e81f1ac3c7972e40a SHA-256: 38e2fd0351db70e4191a79eb00eabe1873f764ba39a554e9ef08618442aa96aa
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or SEO manipulation scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's nature as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7598

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://jottigo.ru/award?keyword=organizational+citizenship+behavior+definition+pdf PDF link annotation
    • https://cdn.sqhk.co/putizimetiwe/hbqDSWB/romantic_video_for_whatsapp_status_download_free.pdfIn PDF document text
    • http://kobasobapina.22web.org/wedding_invitation_background_hd_free.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/LggZdeD/fadikesezezolojug.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/XFijyiC/carx_drift_racing_mod_apk_old_version.pdfIn PDF document text
    • http://weramixizagob.22web.org/talefok.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/ehd1ieX/mini_wood_cutting_machine_for_home_use.pdfIn PDF document text
    • https://cdn.sqhk.co/tupulezi/fhgibjb/sozozovovis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jagodamafa.rf.gd/the_alienist_book_ending_explained.pdfIn PDF document text
    • http://loxonugowutaj.rf.gd/35563873060.pdfIn PDF document text
    • http://poresiz.epizy.com/fivowobokijawobiw.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/maleic_anhydride_production.pdfIn PDF document text
    • http://lofomaseforuz.rf.gd/31594771992.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/xuxepirivutomowanipiv.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 5692 bytes
SHA-256: 22544f7e6e46480e449b70a8fecf8dbbb525606657c0a5b17baed1dc74a987f0

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