Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba521219752701f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 20:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 582ab667ad6f78eb5e8fed5dafc526d6 SHA-1: 707c61db3411ad2a717d0fcbc459b30e640784f9 SHA-256: 1ba521219752701f0c64b0715d09e4602e18c99357ac69d119fa682bcdf763e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The presence of numerous external links, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cargoservice.pl/cargoservice/userfiles/file/dotofoxefa.pdf In PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/6719038325.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/nadamosefoxibikuzobep.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/deviretuxafumupu.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/mosizenezupoligamekino.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/bakipigudilawedojugevamuv.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/2874705386.pdfIn PDF document text
    • http://lachina.cn/upload/file/93391847854.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/guzip.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613809725da1c---7111724762.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/wugutawogafomaxukubonubig.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/20312953270.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210902_4EB1E1D352E0019A.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/68555950437.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/76771287842.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/9805299849.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/gafebifagex.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/12446771907.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/51786402969.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/sivebasas.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210907/1523185499.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/76900193794.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/bedapefifujexesow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+3+player+gamesPDF link annotation
    • 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 17300 bytes
SHA-256: b7e2f8cd6164d9a9b4177c025c2369c664ae91378e13a646df9492d859cd64bc
font_01_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 10620 bytes
SHA-256: 929936f279d7afd4f633a444867a9c813d12b50c52bd9779bcd5cd974e53e60e
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1