Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fabf928eba22718…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 18:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1fc6ebcef23a7f70d85278f92d5953a SHA-1: 52eb4ca44884f6a346a965e9c23032c1a0e18958 SHA-256: 7fabf928eba227182e1d32c46155f7ccb543f74f7496e70e9b703746ab2236f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely leading to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely facilitating the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://noithatkuongthinh.com/uploads/files/ketufunefizubob.pdf In PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/gazagi.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/88274140446.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/fabiregepubaseki.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/54248739291.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/vebuza.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/15633563562.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/6986180685.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/raxewadegagogofugalaj.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/zofisemibax.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/gajajas.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/jedow.pdfIn PDF document text
    • https://themalc.org/files/file/13901103495.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134aee591a32---17035522462.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/pojalamefasijagadusu.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/gobilubifetumit.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/55778337908.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/68448629019.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/69278299249.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/20218839093.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/pufunujixelogubekiw.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/kiwatawogonami.pdfIn PDF document text
    • http://shamayachts.com/upload/file/36034007954.pdfIn PDF document text
    • https://dhesient.com/media/lapuxozukem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=final+fantasy+13+androidPDF 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_off0000c758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 21980 bytes
SHA-256: 4d15875244317b1e5fb4c2376d34298038934c8c8a4c34c62f813465a38e6440
font_02_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 10532 bytes
SHA-256: 7b32e9d45c4b619474b3916b60cdea9148db6906d8939f364e07b60de792c5c8