Malicious PDF — malware analysis report

Static analysis result for SHA-256 801b692aeefdefa9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 16:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e34908ede232a158e44558ea8261ea9f SHA-1: d45c3fc8bfa6460fbbb6f39efad93c80d546a6c9 SHA-256: 801b692aeefdefa9d2626a47f2bca31bdc34290ff5a47f132dfaffbfb068020d
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host numerous links on disposable domains, likely for phishing or distributing further malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=snap+video+app+download+apk PDF link annotation
    • http://alarcon-v.com/editor_upload_image/file/48965061283.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/forabasarivefur.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/fezewarotokife.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/22360764301.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/xokojo.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/68750312332.pdfIn PDF document text
    • http://huntland.hu/upload/file/26925307381.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/58728160.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/15608601907.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/sigetevavidomaravadu.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/mubupadirepazugu.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/fipabuwekevozowisafujita.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/wirarokimipes.pdfIn PDF document text
    • https://csn-alliance.com/data/files/12720470010.pdfIn PDF document text
    • https://service-panev.com/userfiles/50189661059.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0a39d34866629dd6edac280c798409ba/resepupirolerenevavatediv.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3035a474472dd81412c151562d9897f2/diwebuwejidaxazewapixeriz.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/wogedejupodegesutaseloro.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/muzikolagi.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/34021742535.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/52144717448.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/74192193763.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210905211002_xps9g8.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/41281414869.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/xobefudofedabogenasufonin.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/nalive.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/sanudaxixovaxegu.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/1115571406.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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 10340 bytes
SHA-256: 811abcc62145b6c8e6e213a5d8178fb059efba6877cfc295e3dc8bf0f0769b0f
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 19952 bytes
SHA-256: 92479f14b0d0fa40cc0b28ba0df8f936ae0a49b87e5bedd5a2e17b66688e6644
font_02_sfnt_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1