Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f532bd4ba46b5f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 03:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 101bcf7c72eef25a42d8c95d0f0ae6bd SHA-1: 301ac8826e7c7dfdd58e47faa3640d2adcce216b SHA-256: 83f532bd4ba46b5fd783701219588812e009264d8ce951f07517f933286ceb11
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating connections to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=comment+debloquer+le+schema+d+un+telephone+android PDF link annotation
    • https://huuphongplastic.vn/uploads/images/files/35041299709.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109110755316149961hg1nr.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614514ced084a---xivopixilusitaxiv.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/zemito.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/gijizurupowipupugonuwem.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/subiji.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/lupagomuf.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03b3115c6---dalobusokemuxu.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/32511113870.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/21158720697.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/temabiselanasufaj.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/68446822325.pdfIn PDF document text
    • http://pnalog.ru/images/file/2363495896.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/vejunasuk.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/62591621812.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/pavokapugawigajose.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/gizunuxatuvudazemaregis.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/pijezumawomawiloga.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/mijazofakipatuvexoruroma.pdfIn PDF document text
    • http://orthodoxnews.us/file/60091321927.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/posajajidod.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/87716746217.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/25343954494.pdfIn PDF document text
    • http://www.bash.cl/media/file/xudenatinopiruseripib.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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 18572 bytes
SHA-256: 2b70ae7e13ebaf5141934065d18783466718b170102bfc42beddca5bfe071871
font_01_sfnt_off000109eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 11196 bytes
SHA-256: 28e2e91d236f13c20f21337baedcaeb10c48f399c527a35937e716b26bd0eaf2
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1