Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f35923148b5ad64…

MALICIOUS

PDF

88.6 KB Created: 2021-09-14 04:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0d5b43451ad955a88a5ecdcc9c2ae98 SHA-1: 7fc266891b93520da8c2888bc425e199bfdb7773 SHA-256: 9f35923148b5ad6423c83860e2e489c7b27dee63dbd3d5a4a781f6746494f038
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of multiple external links suggests an attempt to redirect the user to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://cpsguffanti.it/uploads/file/85757631269.pdf In PDF document text
    • http://lso-msm.fr/userfiles/file/5010278784.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/nokidupirenoz.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/fawovikovukijojiviroroz.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/gejagozebolidasolo.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/27600811207.pdfIn PDF document text
    • https://turbooto.vn/upload/files/3185232152.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/58351390214.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/kojob.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613595075f568---nimalanuxon.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/68018995015.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcd0a8fb40---bakuwowapekox.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/zejudejakaxazodorab.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/97509130710.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/16153659534.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/juwexibedolugu.pdfIn PDF document text
    • https://digireg.se/upload/93822398686.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161362d5a7b16f---lonepulifuliruwawevobete.pdfIn PDF document text
    • https://produse-zilan.ro/files/13256178912.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/58488215999.pdfIn PDF document text
    • http://erpos.sk/data/files/86644984980.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/21948603986.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/16990163053.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/sitezen.pdfIn PDF document text
    • http://uhorder.com/upload/files/59602682616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=menjalankan+file+jar+di+androidPDF 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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 10296 bytes
SHA-256: ff785d4aa3646f8d76945ed76d17ec9c3b03723bf01229f0344c337c36fa580f
font_01_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 18540 bytes
SHA-256: dfcedbbbda9b2839dc0c2fade40c33f607c334170bab6a79d1750f4855df8e13
font_02_sfnt_off00013c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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