Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca611e1ba8ca446f…

MALICIOUS

PDF

95.1 KB Created: 2021-09-09 16:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 24f8ff58e839f883449fb9200bdd4a02 SHA-1: 207cb43743a9181f7b9326e46c4c243fd700d475 SHA-256: ca611e1ba8ca446fae0328d78e149877fb3f65c7947516e196f2e21e76dc8d3e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://duda-tech.pl/dudatech/upload/file/dijexiwofunama.pdf In PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/50358664759.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/18221374394.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/kufakejesanosanaxilexakox.pdfIn PDF document text
    • http://kelvista.lt/images/files/lalologozirogeburevimok.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/kudoxat.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/rimetenujaxemisuwifavemi.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/10577218608.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0ff46532---vefusitasirisufu.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/bisigupesuvalebefamidi.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/tuxejaresitefobarosat.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/51954706147.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907232807.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/21156704504.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/41678541313.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/nesabekadomozokugagovokom.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/59381220200.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/430214865.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/8956495652.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/vabumodugizexi.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/92057209217.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210906_FAA856AE2EF6C62D.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/duroroku.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/81636060302.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/fuburuwadalegofilinoxup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=antutu+app+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 24324 bytes
SHA-256: c8c51437270a851d1be2a0450052678b454282d2c55cd99cbc4affad335a4ad1
font_02_sfnt_off0001411b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411B 9760 bytes
SHA-256: 33813fb94519c2979340b3c06b5e5353913b198364e776be8a79c12d5d6aa9b4
font_03_sfnt_off00015690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15690 16644 bytes
SHA-256: 9fc78141310d4bb0c0b63ad7305ac2e2ca5bff32943834732dc6aae366e941f2