Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c46d5f72a3c5505…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 19:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7612bc8cb9806c3d2fe2cd6fb8a0d0cf SHA-1: b9c0a9d13dd27b710ff1ceb99ddf5fb89265ea81 SHA-256: 3c46d5f72a3c550565d6a9ae5d6489e2de2dbfb5db1789766420534e630d9467
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wroclawmodelshow.pl/ckfinder/userfiles/files/74694896391.pdf In PDF document text
    • https://aakritidigitals.com/userfiles/files/silamegovufakad.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/29099052431.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/jinotoretobiwupokaxu.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/42889697602.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/warikirufafelegodusatu.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/52879715256.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/bofukupano.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/likusawojadizera.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/dugotugavokogeto.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/63725227447.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/44979814027.pdfIn PDF document text
    • https://adikketiga.com/contents/files/76217041750.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/libomumoporevatakawevud.pdfIn PDF document text
    • https://fivetc.net/uploads/files/rojafuxakarenisi.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/mesira.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/nadopovupumofuvem.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/wagufejib.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/80814224748.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359f7ecbb45---59617550566.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/89864311280.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/tekibevopurexofe.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/lixujupipew.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/togenarogobisadosipa.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/mepajenegepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vector+differential+calculus+pdfPDF 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_off0000c690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 17752 bytes
SHA-256: e60a162470163a644ebb8126e2581bb6b23ef50c3f9a711e0687c4e56f98ed48
font_02_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 10680 bytes
SHA-256: ba73b12dddf5226c8d050e3e4a821ec57c546c70c5f4f64bfd61635c794d8b23