Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3523adb8fbbf0b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 03:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e21120c487ba51a6ebaf998932d38a52 SHA-1: 93b2908c2aedeed645e11540a43b1f20a1729a72 SHA-256: dd3523adb8fbbf0bcfe2d883e7f79f03c7df844e87d2c17380826aeed1ea67ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.edm-medical.net/ckfinder/userfiles/files/wutetudonodo.pdf In PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5700c2aaf---88456485330.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/notedepomumowusafi.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/movewisuxuromexiv.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/73573566557.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/bedefimow.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/81582043487.pdfIn PDF document text
    • https://cardolf.ro/files/repuv.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/22531188865.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/zamiw.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/41452775828.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/wogabasagubupowofisu.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/lazunejawasenojezosotox.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/senasov.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210924085453_fn4ch8.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/defalebipojikoxepele.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/xupasodakesubazepagopi.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/95acb67bf6b8ad44f9a9e14af3aa81dc/vajekobuno.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/59822707503.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/fuliv.pdfIn PDF document text
    • http://sciattella.net/images/file/bipipanazaxeguzepixe.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/17242463282.pdfIn PDF document text
    • http://dentistturkey.com/image/files/wedorunonukugugivozusamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=geometry+dash+full+version+free+download+androidPDF 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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 15092 bytes
SHA-256: 6226e33d10367e00341fbd12feeb2c930a24cdc809b672088df9b57113f5e764
font_02_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 11024 bytes
SHA-256: bfe1db70672b984aa20e7b5a6e4b06cc721b9929b11f1c3a6c2af37fdc476b1e