Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd772dbf4b47e0e0…

MALICIOUS

PDF

85.1 KB Created: 2021-10-15 09:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 52a6acb3d51bb256de59f7899574c3dc SHA-1: 079ce127d5262155edc9893a1514137032d1b3c7 SHA-256: fd772dbf4b47e0e0a0e262f8b3f519d9523411c55d85a0aa186342b4555f13bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojanized document. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://crysiq.ru/uplcv?utm_term=credit+and+debit+card+worksheets PDF link annotation
    • https://gemma.lucien-sv.info/uploads/files/6153930feb791.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/11082835000.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/879809778.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912444b7b9---64553960065.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/wosof.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20211007184639.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/lemexupuli.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210909160657_u112le.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/vidojefumejugixeza.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/3471806366.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/3710425272.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/96408279639.pdfIn PDF document text
    • http://geraldinekilkelly.ie/faxanumulezuvijopevamen.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/19109724009.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/pejemivodova.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/muropis.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/fuzokedutixulif.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_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 18156 bytes
SHA-256: 1d747bf1952c312241d18819c01698cd1631fcffc41422ede11819fd22942a60
font_01_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 10768 bytes
SHA-256: b38aeec6671bb435ac3931a6afd9b67b8fdba1039ed7d1bfcaeed48e13eeceb4

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