Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad63db386a71fa7…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 23:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c8fa267df10879ac04bdd37176b26c1 SHA-1: 71d0ede2352abdb3d31651db59523bfcc7642ee0 SHA-256: 9ad63db386a71fa7ffe2e958ee8e9637ec6c379a28440d6fce6e7dcf997cae83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=nigel+hunting+bear PDF link annotation
    • https://chsins.tw/uploads/files/202109121410239253.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/lisidipokidipupodowupivim.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/1379731979.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/2942565058.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/rowevowu.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/764b8971325dfc8d173259c6c776a448/64008178737.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/nasaxuxegoj.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/nirere.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/23620220870.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210909203553_wf631g.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210903050739_630zby.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/lapejogefukubob.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/6534326779.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/10831309977.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/43985770316.pdfIn PDF document text
    • http://gibisch.com/files/files/80955502244.pdfIn PDF document text
    • http://ubest.ru/images/file/gaxeretamabik.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/nexomanex.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/57004068510.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/nubigugexezusoxo.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/92775706425.pdfIn PDF document text
    • http://citra.cl/userfiles/file/jolukisuvebiputoladexoki.pdfIn PDF document text
    • https://activepymes.com/pub/file/75685740776.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/31954937818.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_off0000c0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A6 17452 bytes
SHA-256: be130f09e094da4f06cef3bb0731b319f3abfb99f08d745d5fd1dffc24f38c0e
font_01_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 10316 bytes
SHA-256: fac59523d3b25c38f43eb3fedbacd9208818504abd8a6b3e1a3801a762e108f9
font_02_sfnt_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1