Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98e3bb5c7f19f7e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 03:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1af135f9209da57fb281301fc0dedf52 SHA-1: e722d3127e16aeb3761302d1742760da41d86201 SHA-256: c98e3bb5c7f19f7e0e84a688a09fc3aa89e4977f71aadf46280db9e4ede928e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains hosting other PDF files, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://odumakus.com/uploads/files/majiwiziriru.pdf In PDF document text
    • http://abwnickersonplaza.com/uploads/files/sinagezijogaxisaguran.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/lexopilago.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/defujizozasojikubux.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pugupoletetew.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/tuxidapopirabifulu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d0d7fea7---96076257275.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/36027776659.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091304180487.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd8a52287---51867054859.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/vurij.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/bunemuxazoxedapinavi.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/gizixagudamegop.pdfIn PDF document text
    • http://cwesp.biz/upload/file/vonigab.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210908162754.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/94105408355.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/sosoditolasituzil.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/6747204222.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/xawopaweneruwutatukegub.pdfIn PDF document text
    • http://exim5.hu/_user/file/rizalogibupiberuxo.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/vugiji.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/82562506642.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/lojelenukupidetowesuv.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/9376113529.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/18840663417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=john+wick+2014+dual+audio+720pPDF 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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 19012 bytes
SHA-256: c99e4b4a853451fb4ab996e5574d8375231157ed7bccaae2c9ab4f412843c199
font_01_sfnt_off00010c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 10804 bytes
SHA-256: 41f922287430821e0fbf3bb32abd50c53ba98cb5a643dcd149892c906e1fe38f
font_02_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1