Malicious PDF — malware analysis report

Static analysis result for SHA-256 086562769e75cc0c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 23:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4e1c1c6b68415c7f963c88d6d721bd63 SHA-1: f380d1f7e41a1799993d72d10d868e6570e2c5bd SHA-256: 086562769e75cc0cc33eaa1efa84a74cf7efa8543a2f7a22058d4d838f0404d9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or unknown domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, suggesting a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161324597d9790---83759701690.pdf In PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/98558931313.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/posuxesudekaxivurupafafi.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/95461592246.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/gojefikitom.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/72310523573.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/sojot.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/68538033166.pdfIn PDF document text
    • https://angem.fr/userfiles/file/zarafotafotupikoguzegenip.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/44216280415.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/32904889365.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/4646354276.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/73712230603.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/11948301232.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/pusurawijukeko.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/42363843630.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/68337872600.pdfIn PDF document text
    • http://weingut-suppan.at/files/26132760812.pdfIn PDF document text
    • https://onlinendttraining.com/files/fusazelevepabibote.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/80722058149.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/94398262698.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/lalumidetobo.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/lerumaruta.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320eb7b62ae---kikisusomifirukegilemi.pdfIn PDF document text
    • https://dptech.vn/uploads/files/26573975959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=focos+alternative+for+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_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 10512 bytes
SHA-256: 638f872744dd51651073a759eba5774a460e2b716fa46bce8546b07a8f217157
font_02_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 18344 bytes
SHA-256: ec4bbfbddf2194c5b522398ed3eb24ae925317dcd699d44a2d97a4c853ad8ab2