Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cb5e85e77e3fd8…

MALICIOUS

PDF

91.5 KB Created: 2021-09-20 20:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24b1b076d94eb97fbdb41c1b0a09e91a SHA-1: abc34ed9387e94a8e2ad4a8ce285d06de8aa6b10 SHA-256: c9cb5e85e77e3fd8ef1c9277ddd954f4d53fb8eef93225d809ad86f58d72cccc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JS points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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 http://saktigroup.in/uploads/tizofalu.pdf In PDF document text
    • http://to-kajihan.net/js/upload/files/60130328728.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/7098123128.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/69211993156.pdfIn PDF document text
    • https://mlspoland.co/files/file/58711795651.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/14710982226.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/golegiwezasaxuvomuteb.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/50002639199.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/77157537653.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd03ed730---notekela.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/mipixekokuwuvakev.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/riduve.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/lekexexalonejoro.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/59050676258.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/94524771655.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/wolizoguwobepepodiremoje.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/matesifivakevupibopuru.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/xepofet.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/9827862319.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/fijinawulelorikajun.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/29081191627.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/navufoxudejenovosubo.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/85447676769.pdfIn PDF document text
    • http://fruitvita.com/files/files/katatazasitasaxamasapefuf.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/8121955273.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/55824554686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=spider+man+into+the+spider+verse+streaming+servicePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 17976 bytes
SHA-256: 435d07496b405df06b993a11d2ad68344d88b9852adbf0b861f1314bf49c20f3
font_01_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 18316 bytes
SHA-256: 4d3b4059ceb9368bc0f50d32371ad799a9eae8ffb2801fb1202b5a3e18b95203
font_02_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 11056 bytes
SHA-256: e3e3479ca211233ad9de2ea831f645ca4d97dcabf3c63d9926d675dca6600b73
font_03_sfnt_off00014722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1