Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa0caf9f0694a6d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 09:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0232dada5fc23d59b204a6d6787d5e74 SHA-1: ac4ea438a52ad480438b0df76a78d7e8990428de SHA-256: 7fa0caf9f0694a6d15cc1f24207b9bfa99e9fac10d517b14380e4b6122839f9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=gg+no+root PDF link annotation
    • http://milkyway-vn.com/upload/files/fizege.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/13864828504.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/ferufimabodekugidi.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/poviximinuvid.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/25954421062.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/zopepixamumijoreseredo.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/junifufujutefazoribuvu.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/20615223234.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/ludowutozuwebix.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/leviwanidasukibofi.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/temow.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/nuwipapo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9624d038ee02f2759af6eb9918d5b6d/25287506875.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/40228446822.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/2109011316589884242yikm.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/21805454313.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/xizibavuxejixe.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/japozow.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wasagiwitajepadisibosuwe.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/fejew.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210911_070907.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/78214311985.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_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 17936 bytes
SHA-256: ca54dec9aca3e94691be2df80d62373bf34c3cdc8770c0c50503a7153e9e1e46
font_01_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 9724 bytes
SHA-256: 0c8368c27d3feab2d903894641d50804a9ca2dcba0b6e9e9e708bab157c565f8
font_02_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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