Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b21369bd8ff673c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 01:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b62c9dcfbc71f48f4726057d60256f0 SHA-1: 0dea6729028ab5985dc80d71a79605d1ff1ec4ca SHA-256: 6b21369bd8ff673c90e885715e21d5a506eb76c22fddd18bd238ee35a0ed7cea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm on disposable domains. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ambvetfanini.eu/userfiles/files/beweruxupumukogob.pdf In PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/69069859921.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/25197563247.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/23086318744.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/gazumexarezororexuxinovor.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/busimojisezozemetigutigar.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/bawaranozupafon.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/barelituwakeguno.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/xujafewurunixasawi.pdfIn PDF document text
    • http://canoeing.by/pics/files/10385173387.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/kuzega.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371902a2796---litunodetafovukosatalijik.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/59297310972.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/32075809173.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/99115711830.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/55073930500.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/23804917925.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/90718049662.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/32380230217.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/sepukowi.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/44994745828.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/temugepulugodirimuxa.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/22672186685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=chandoba+marathi+bookPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/91808448065.pdfIn PDF document text
    • 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_off0000ca1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 17868 bytes
SHA-256: 7c62256f4c578e6e882cb0fbdb34febee0d02a73cfb736dfe9a5e879ace25020
font_02_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 10432 bytes
SHA-256: f834207b1408c66b06d163a6699e10bbe1ece2b4960f4497704ec1910f261be5

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