Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1519b2b5132439…

MALICIOUS

PDF

74.1 KB Created: 2021-09-09 18:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4795455140520ecc0ef7f10355e0d512 SHA-1: 864151bdd1631fdde8b0de4263fdc529dba79963 SHA-256: 1b1519b2b51324392abf3f4760a3e31b61138826cf9fa129be49a55b57794f42
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are likely used to host malicious content or redirect to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349fff4a063---maragovovarixuwosate.pdf In PDF document text
    • https://hanyauntuktesting.com/contents/files/6131763183.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/vedipegawudazovoregiso.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/44626784625.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/majokagagejotagezutoli.pdfIn PDF document text
    • https://ubranni.com/uploader/files/62820344765.pdfIn PDF document text
    • https://binhvi.com/upload/files/5290586995.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/baxugilolujurazop.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/55111142886.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/magulejupifafinodo.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/19746719725.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/85552808573.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/patedowibod.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/83453566733.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/9740567197.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/kevaxewupe.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/ganoniwodozodubekivow.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109061908058833.pdfIn PDF document text
    • https://kar360.com/resimler/files/76477362851.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/kepujibajo.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/jobumukawepudekevifozukej.pdfIn PDF document text
    • https://eventaipei.com/upload/files/xotowaruredoxovet.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/88176783367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=khan+and+jain+management+accounting+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_off0000beac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAC 10976 bytes
SHA-256: c9f261a037b131097af9f6a86dda25f1565f825c7c0eaeb38c9a1c417a14b073
font_01_sfnt_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16752 bytes
SHA-256: ad2389e70e1cda368751c4e18eb0d5773a9b404c27b426b377ccf2a06e9da7c9