Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a36f7811ad6853…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 15:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f7ecf304f357035423040851972f9f77 SHA-1: fb16290834f9add954455af6ecd8cdc8323b3693 SHA-256: 49a36f7811ad6853e8d6ee8d90a605ff5221a72b2104b74295552b032158d917
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm on disposable hosting, with numerous URLs designed to trick users into downloading software. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://chcial.ru/uplcv?utm_term=setc+bus+simulator+game+download+for+android PDF link annotation
    • http://gelinyuanyi.com/upload_fck/file/2021-9-25/20210925121700466631.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/37054645494.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/45280714734.pdfIn PDF document text
    • http://flirdining.com/uploads/files/gifikebipironi.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/86522859289.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/lugapuxekevugeji.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/49472543055.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632076642.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109202259078134.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/nodoj.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/vuwunozupugonidag.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/nixudiguzagome.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/wodofowizefokuzobujupa.pdfIn PDF document text
    • http://tipiland.net/upload/file/negezijo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613318fcaad5b---wesedosezotadebuw.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210917055337.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7502330bc---36099934248.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vamumogumidun.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/90620551407.pdfIn PDF document text
    • http://lawngo.net/fckfiles/nufegosunidevaki.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/2330381540.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/99410659543.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/39535760455.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/73534269381.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lofotikajeputavadafamuto.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_off0000b08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 11220 bytes
SHA-256: 162624a1985a14d7e17a1488f9dfa8bce2f3f2ecf999ce05f3c4783630ce26c8
font_02_sfnt_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 16584 bytes
SHA-256: d1f8689bfac348b63a79ffcabac88b6a943a2e2c3f6d17a98ffccd553d573038