Malicious PDF — malware analysis report

Static analysis result for SHA-256 66506b9848ccad07…

MALICIOUS

PDF

70.5 KB Created: 2021-09-14 14:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03942e4cc3cdae83ce9681b1e6fdafd1 SHA-1: a0f7dac367392278492760067d219fdec790b444 SHA-256: 66506b9848ccad07d4c081660132ae95ff2006b607372d5ea331e3e19ef65837
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a tactic to obscure the true destination by using many distinct, disposable hosts. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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
  • 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 http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/61758947872.pdf In PDF document text
    • http://pietrek.com/MARCUS/files/file/52432668774.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/61189891001.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a8f657dc---37625156568.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xutum.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/2833985178.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/89432792620.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/ritepewexufanimaredad.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109020856169906.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/461283520.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dulasaloronusetujetem.pdfIn PDF document text
    • http://balone.net/_upload/file///78536758975.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/56122359689.pdfIn PDF document text
    • http://ustunongel.com/image/files/rigipozevujopa.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/nojawebeke.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/nevebodofapaziregemutu.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/lowunet.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/11258901490.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/91701708217.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/74324391337.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/08212200520.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/58085432793.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/29241630062.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/81565584465.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109021802525204.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/fizudij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lilly+dns+changer+apkPDF 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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 10736 bytes
SHA-256: b428ba39098ca1de18a8c61019644fda55fdd1c8d9453bb2ac5bea1fbd96cb84
font_02_sfnt_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 16204 bytes
SHA-256: 16c5d74b3a211c738504521c46b3fea71f61d428ef5eeb8bd337cbf407d3cb9a