Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1b5ab5b9bedc3a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 03:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22f4c5ddf1f8cc89a9033cb4748bd9db SHA-1: 256c47cd691613db21810302e832f52ab40816f7 SHA-256: 3d1b5ab5b9bedc3a657995dbd40b0e1de5960e5a1964b03a0b497cbb255446c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs, many hosted on disposable domains, suggest a link farm or phishing campaign designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://wastran.ru/uplcv?utm_term=android+time+sync PDF link annotation
    • https://bike-accessories.supersites.gr/content/ckfinder/files/66610665566.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/miwikugikamezob.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/96315850891.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/fisalawarugube.pdfIn PDF document text
    • http://newmob.it/userfiles/files/66295736575.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332503ca12a---68564680994.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/karokivevepaguzofowuwi.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/12223415163.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/fuwiduxavasila.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/99911273964.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5cab1af82d4a7c8552efe80b55419bd7/nofozopogodisesidag.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091410045073499.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/mavegozugaziduzid.pdfIn PDF document text
    • https://alev.az/userfiles/file/dasagexilelovubunugapari.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/dafolekota.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/71151010984.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/zujejonajeli.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/jedetale.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/20895306815.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/85748929405.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/sagurafir.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/mupigokolutuvu.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_off0000d04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A 17628 bytes
SHA-256: 3a39126c1ec7c2059a2f7f9069d2180823ab7bb10054e90034a596f182be6268
font_01_sfnt_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 10420 bytes
SHA-256: 25e73676304e464bf20d1cf810a82986c55c4210a4bec98ab79f65fa7c8315f3
font_02_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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