Malicious PDF — malware analysis report

Static analysis result for SHA-256 8851f622cce32763…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 20:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a760ed7e5b821f2ee9b28c5e60f33aa SHA-1: c60bf32c5366fd0fee7d87a3a581d6850ed9e63a SHA-256: 8851f622cce32763b3caa0ae7894306f717a5ccfbd69b93d4617167297535898
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. Heuristics confirm the PDF is a link farm on disposable hosting and ML classifiers strongly indicate maliciousness. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=iphone+to+android+bluetooth+tethering PDF link annotation
    • http://angelofthewinds.org/ckfinder/userfiles/files/ginibejufojomux.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zidadixopen.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/3813280214.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/13157282282.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/17495258756.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/zazurozulapajopofitezovaf.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/78127241220.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/jukozobakejijuzunusakud.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/35951348274.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/71701980801.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/golawenusasegufujanij.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/jafopusozuken.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/56063596508.pdfIn PDF document text
    • http://labradory.pl/file/34106385215.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109032333433501.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/tesabogogabinarizu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4db59dddf---kegedifemojujubepubizix.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109021022338780.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/evqu2bha3bepfhv2kqn95dqji5/jizusujiwakilorilujulifeb.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/44502325605.pdfIn PDF document text
    • http://vitrine-prof.com/files/53767442962.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/76962689438.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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 10692 bytes
SHA-256: 6c0a731c4d41f269e71c5cb95d3ece038a2449f8fcffb3944698ca92a5860471
font_01_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 17264 bytes
SHA-256: d74776747be5ad03ec72c41ce592bba8d86e4c7c38982fee086afdae4d9ad477
font_02_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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