Malicious PDF — malware analysis report

Static analysis result for SHA-256 e639d7f38ae28124…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 16:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9e771553c272477251d0d5a719152a8 SHA-1: 9e0c0b26aec6be7dd849a159d88bf08ff269b788 SHA-256: e639d7f38ae28124b6b21e9526c77f27716e3f3a01fc8ee893fd6bad2f11a8d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to unknown domains, suggesting a phishing or scam lure to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dpengineerindia.com/admin/userfiles/file/50842661905.pdf In PDF document text
    • https://atvatextile.com/upload/ckfinder/files/wanigo.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/godasizomid.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/47122280994.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/wikivedal.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/rotari.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/zugixagowoj.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/gurenisa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e5c58941b9abbbe345691803c9fd9e50/salotuf.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/zukemixomesaw.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/xiviwozil.pdfIn PDF document text
    • http://furniture83.com/upload/files/sazenelonupigivovefogara.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/51163782153.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210910035928.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/viweture.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/7877488366.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/zapasesejuvosizejusamabum.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30475528148.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1561746605.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/40355805281.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/85432517865.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/67337926174.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191200297892.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/62147368482.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f47096967---76270916880.pdfIn PDF document text
    • http://tyextractor.com/d/files/bonisugafir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=goku+psp+gamesPDF 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_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 10388 bytes
SHA-256: 36519d4e56f3ffde7e630361cc41471f6ffd0466451e129c28d2e52c3b4150b7
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 17960 bytes
SHA-256: 7818fcc9eb90c03f1817c8ad70ed66888cfd281b5a82ea0944dff1ac377fef84