Malicious PDF — malware analysis report

Static analysis result for SHA-256 2508d3d1444e7e1d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 19:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e7c2756e536aa7e69c5160a6a0325889 SHA-1: dc4305404a80e3c8eabf19b3e3360da8329c0738 SHA-256: 2508d3d1444e7e1d7c1e71592252d8c9776deb63598c0f85e1167fc9eabb340f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://langyupharm.com/upload/files/jedak.pdf In PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/ridav.pdfIn PDF document text
    • https://argumentua.com/i/file/xowox.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/22055320315.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff88dbd8f---71871608696.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/xepinawixemusudijole.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/losovawukosiser.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/navifofupidufokanewa.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/35099995904.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/xisivitamox.pdfIn PDF document text
    • https://webaruhaz.solar-napkollektor.hu/js/ckfinder/userfiles/files/lazikibajexirejoga.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/gupivigafuxasepog.pdfIn PDF document text
    • https://davnosti.ru/upload/fojumag.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/xopabafuzulevopaxa.pdfIn PDF document text
    • http://elpijisystem.com/file/55087855952.pdfIn PDF document text
    • http://pileki.com/imgup/file/94148411811.pdfIn PDF document text
    • http://master-vin.ru/files/file/gitafizitijosusalogi.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/gavotimijigexopopebu.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/30214719457.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/34254573592.pdfIn PDF document text
    • http://hanauhrova.cz/files/nijusufikiwotowoxawabafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+go+ipad+gps+signal+not+foundPDF 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_off0000ad70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC587 10936 bytes
SHA-256: 156d8e6fdb396590466e10c21ec4238ed20f8486448a65eebbdafc558e372533
font_02_sfnt_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 16468 bytes
SHA-256: 3f28a765b63d7d3eaa8af80d1808af0b613f5c17733da7e24245af8a941fefd2

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