Malicious PDF — malware analysis report

Static analysis result for SHA-256 922ba99240f74e46…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 18:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9829a8c440021112b76bc9bad4acb0c SHA-1: 7ac8214dc5ff30a58ec9be794d02e4c281d8fbf2 SHA-256: 922ba99240f74e46be040759a2a6ccfc53cc43c120251444491c57bef558d311
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through these external links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://crysiq.ru/uplcv?utm_term=malayalam+tv+app PDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613014413e15f---malor.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/53464269625.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/kaxonezobitokexajudu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/700465996.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210906_112EC916BF640548.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/doxavisuzasizanivudotogir.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/wivovumuwolakutusinaf.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/luxifex.pdfIn PDF document text
    • https://people11people.com/uploads/File/gebofuvijevizixumeb.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/56034279627.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/vagidufetimitotipatozasug.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ok2j5sve24cdiuhlbuonmpochj/13934615836.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210904231324.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/fofesomupemoxalibu.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210908230007.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/55272544702.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/logukewogedidipemaz.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/kinimuwuxilemenubej.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/nojelalakumijape.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/65813961599.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/69874768613.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/10718396168.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/wasuwusukibuvewuzaxawepi.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/xulizavigos.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109101843156861.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_off0000cc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 9872 bytes
SHA-256: 3ea1ef5f96b3e50404e0c208ea2c7a7a87983bf77955ade3ddfab4f00fa6d8e5
font_02_sfnt_off0000fa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 17836 bytes
SHA-256: 2ff8b4341ce595e1a347d38803e05483a8bfcd66b0c818b8d2cc1c5cdd9676cd