Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5e87ef9ecabec2…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 13:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b89cf11acb1fad2731dc454531657d7 SHA-1: cc09d27e00053edc0bbfbc20a539e534a3a8da83 SHA-256: 3d5e87ef9ecabec2ec77a5fd669185612831a7815ea7ab1d6eb81b256fcc0afd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, possibly to redirect users to malicious sites or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://energosol.pl/images_cms/file/puwopepiduwawojo.pdf In PDF document text
    • http://unsersohn.ch/images/file/43770278917.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/21799810964.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/lexikunupisavakam.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/84297250793.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/26645082170.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/53216287205.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce2834377---gerujowofapajibusi.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/44017237472.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/kunek.pdfIn PDF document text
    • https://ubranni.com/uploader/files/80419759914.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/12102881305.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/85544462332.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4kqgnag68nqrg8grbofh59vm00/5771485317.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/11847508873.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/ridebasiribubirokadapagi.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/73554835456.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/62368243789.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/17261307582.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/83664072584.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/58297851638.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/37690871773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=twelfth+night+1996+full+movie+freePDF 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_off0000ad3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC551 10936 bytes
SHA-256: 850313d35839a2614d8541b6d7e2af39107bad1e54d16183573b977220c3e192
font_02_sfnt_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 15648 bytes
SHA-256: b6b9f4acc7d85891c2f639b0fcb7632a379aff14fc2230646e1d4addb4f56861

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