Malicious PDF — malware analysis report

Static analysis result for SHA-256 9846e548a83506db…

MALICIOUS

PDF

85.5 KB Created: 2021-09-10 07:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38d86c7827d008af50d966f334c90b31 SHA-1: 3ea53fac9250b3ddce23f8b23fad7ffcda0b8b54 SHA-256: 9846e548a83506db7ddd6a2e259e08c041f363ae946aa88d11ad3b33612a3e07
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external URIs, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://synerhu.ru/uplcv?utm_term=organizer+app+for+android PDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161307616439d7---nitozutiluvimurekebezik.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/vozitugumada.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/vosawibukalurazitikovoril.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/gotozuvexeruwodobepi.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/252576488.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/basigilanuva.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/86555251744.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/36532910159.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/10051539359.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/jikapitupijagofesigid.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/sagigup.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/joruv.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/jagofegomasuwe.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/rorowamagefonu.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/nelelebuvutakobotoki.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/48114015919.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/momawag.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/52880615234.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109050649173330.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/vofuxufepaj.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/5982820779.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/50097604045.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3d683e4e---24936472987.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/xuniguluzenefawaw.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/13657884086.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_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 10448 bytes
SHA-256: 3b95f404984794a64afb1da877ec4b316e497e54c6946d1052e90348037b1f0f
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 17180 bytes
SHA-256: 35f2fbf4e72d55e830561b657968c4a199c47e0c7e8f80578269cf3cce259660
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1