Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccc81c81336d417…

MALICIOUS

PDF

74.7 KB Created: 2021-09-11 02:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6c810b08418984c99975bad236ed4167 SHA-1: 7f8fd51e650e65f35cb850ee7b535c4c641febe6 SHA-256: fccc81c81336d417e6aafd3624d6abcdb9eed91dc1e275e0027c9ef396984b2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable or suspicious domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://gz-theoutfit.com/UploadFiles/FCKeditor/20210908145848.pdf In PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/buwizugaloviketasiv.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zugezaxatiwulibowifufore.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8f57efe9ef8d2d9e6d62e7343f1cf2cd/paniwowejoxegisuzudokeve.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/nugejukifetuw.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/46397768480.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/vovesumajerumodidiwaba.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/jodesilomimatam.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210901_598F7E03A02032E2.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/gudopofe.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/sosuxav.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/92777262562.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/bisinigijeruj.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210907193626.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/zuganupuniwadejitev.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/fifexid.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631314024.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/foriwexozivaful.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/bobinumimapapake.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/87878086596.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/95476448393.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/80034098099.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a913d8bb3---23245488142.pdfIn PDF document text
    • https://partnermind.cz/images/files/78580939284.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/doxavisuzasizanivudotogir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hansen+econometrics+solutionsPDF 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_off0000bf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 17576 bytes
SHA-256: 88ce508cc1a5deacb6c59913d10d98632e2d86a3edfcdd97cddf46fd94185dab
font_02_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 10480 bytes
SHA-256: c4ddda6a6eb1f9b5665566993208e8349c72a2ffb17310783c2307bc2d49ed1a