Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67b38c392bf11b8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 21:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 054b68d581e999ea85a9cad11237f538 SHA-1: 029de276ea8f6a507f59b86f2de5307a51065092 SHA-256: c67b38c392bf11b8c0ceaf8566b632e50aae6884fb0dedfea6c72bad14ee065d
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, suggesting a distribution mechanism for malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be instructing the user to decrypt a payload, which is a common tactic to bypass security scanners. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=es+file+explorer+for+android PDF link annotation
    • http://ropesadventure.com/d/files/62105855422.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/saluvusuwomebugup.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/011848364370.pdfIn PDF document text
    • https://orangerun.re/photo/files/14324451006.pdfIn PDF document text
    • https://blokhol.com/upload/files/bojigekudokemobawakevita.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/76293432923.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/65091276155.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/95124815406.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/33979781912.pdfIn PDF document text
    • http://cl-pub.com/files/files/89399311888.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccefbd4a3f---89193370234.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/26493228657.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/99942444704.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/tunagudubugilawexebed.pdfIn PDF document text
    • http://onlinevay.com/upload/files/suteru.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/viduwititudame.pdfIn PDF document text
    • http://grotech.in/userfiles/file/79670800207.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/48641642542.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/25419805265.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/zododisekobu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161418da4cbead---nenofinarufatobunuvib.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210904_AF1B82C4C73715C0.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/97228231919.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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 17684 bytes
SHA-256: 5ca8b8e87f6035be7dfc7708ea46cd36390b539ceed2481cc4b5909aa7c7bbea
font_01_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 10476 bytes
SHA-256: 7b100a66a51c84f9dfa59ee128663c2a6f4d8cc53d29fb86084199b3ca8a0420

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