Malicious PDF — malware analysis report

Static analysis result for SHA-256 c895bf1af6bfd494…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 12:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b9d810aea98e007312f03735324db89 SHA-1: 7b4f55476e50764be1c8024ebf0e578b61e95bd2 SHA-256: c895bf1af6bfd494c8b4f59281df9eee5c7c0b27a9db3545e16125d46c9db73c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://jts-electrical.co.uk/ckfinder/userfiles/files/92303471206.pdf In PDF document text
    • https://southafricapools.com/contents/files/24658459254.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/zonixeva.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/87823493574.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161365650db50e---89548918018.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/4389885908.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/12feffe07451de4373e60aeccdaff331/56905913487.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/12469194523.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/rumuguzebevevo.pdfIn PDF document text
    • http://iscelenie.info/files/file/3832572784.pdfIn PDF document text
    • https://lazerom.pro/media/file/59480935308.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/zajojatu.pdfIn PDF document text
    • http://birdwatching.sk/media/file/8057989991.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/fomipipu.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/buvaluxigobajejinaboku.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/josavilosoramej.pdfIn PDF document text
    • https://membermimpi.com/contents/files/44759936456.pdfIn PDF document text
    • https://majubesar.net/contents/files/65578254616.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/sirirasaxasekutuj.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/5862258573.pdfIn PDF document text
    • http://a899.net/userfiles/file/laxuzogifaponuruzazolara.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/mazases.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jatiwokam.pdfIn PDF document text
    • http://zae.me/datafiles/file/66846314022.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/56037137146.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/88256323135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+usb+debugging+cannot+find+devicePDF 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_off0000cd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 17460 bytes
SHA-256: 26c30f1280ac5f99e0a54a663cf54cd0ed19c3a68290f5e0d3abc073879b8657
font_02_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 10892 bytes
SHA-256: 27befc8854c0f923f31ddbce25526fe5764275fd7babcd3e76e7f744ed0489f4