Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1c527f11324e95…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 22:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd8f1d90647d7ee432ae4e8195172327 SHA-1: f191db91fbe0b07f57c6020e3eeedfab2681f61c SHA-256: 7a1c527f11324e956d0ad7a0f96ae6e78f8309686b1df0fe50546ba14eb9d4f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to disposable domains, further indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=spanish+movie+apps PDF link annotation
    • http://massimosusto.eu/userfiles/files/ligofapuf.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/0c9knjrg8ej44vb23t2k8pbn51/34124686521.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/punedefagiratomenizoxebab.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/9809515815.pdfIn PDF document text
    • http://soles2walk.cz/data/file/62854332682.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/pekirug.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/pikik.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/gasibubenidivebi.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/mabemojanil.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/fivobosorivi.pdfIn PDF document text
    • https://digireg.it/upload/58581128789.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/goromanerit.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/75779938586.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6568092542.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/fusodolugojiviwolokuvet.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/52086221441.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/40384297348.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/62244891412.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/94720643555.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/30972985902.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109020727499192.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f90fc2e4e---xebipunafilenoxowad.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/49662269231.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/16073045180.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/rerat.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_off0000bd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 16884 bytes
SHA-256: d0e5e4cecb88affac959b927b8b2dccc864cd7bc8e2433faf226eb9bab2627b0
font_02_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 10412 bytes
SHA-256: 6888c141a301fa7269e84a6a8e31e1ea67372bfb990f78c035cb20a3c285b0a2