Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc72a2c6e2120d27…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 15:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7772e90c3205efb4d30451589cac4b8 SHA-1: ecfe0f8f4bc5504919447a767ded55c2a7a25455 SHA-256: fc72a2c6e2120d27105a33097824e3e0cde8fd0783d877c9071302921add43a6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious PDF download. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://skazka76.ru/pic/userfile/38569349427.pdf
    • http://medicaldistri.com/ckfinder_files/files/gibakonetat.pdf
    • http://phukiendoxe.com/media/ftp/file/77883160887.pdf
    • http://fipjp.com/userfiles/file/vufivesux.pdf
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/dodilenipududikulafekef.pdf
    • http://bluebiz.kr/userData/board/file/14760005279.pdf
    • http://iglozawiercie.pl/zdjecia/file/folaxotefigegagefurojixiw.pdf
    • https://giltmorestukko.hu/ckfinder/userfiles/files/monolisupop.pdf
    • http://macabrey-luthier.fr/data/Files/gazaferowavazikagiro.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/jugoreronisutexafapo.pdf
    • http://xutricolor.com/uploadfile/files/6457371932.pdf
    • https://yar-net.ru/userfiles/file/38157928612.pdf
    • http://dbexpertise.fr/catalogue_dynamique/file/fowuzabetifoxibixu.pdf
    • http://thumpamonpally.com/userfiles/file/25055944362.pdf
    • https://kcharp.com/ckfinder/userfiles/files/95546377028.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210905_F79283D0D7188342.pdf
    • https://bhavanarayanaswamy.org/userfiles/file/97208685297.pdf
    • https://actor-conseil.com/files/file/gonefajesiz.pdf
    • https://indicaperu.com/userfiles/file/vitagolupaxufugemuperis.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133582ba2fbe---28480392479.pdf
    • http://biaikatolikus.hu/files/file/nepuvebizegelegiw.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/irbdb9knm65nj9v3fafh3505r0/tawexuxuralixobiragomi.pdf
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/98428364951.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=3+ninjas+knuckle+up+watch+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da70.bin
0b72c72c6732b116a1ce9e8369dd8726fbb3321cf6b20b6503b7e895c377f612		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 17876 bytes
font_01_sfnt_off000108b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 16792 bytes
font_02_sfnt_off000120c8.bin
5d0edfcdf128cafb4e98ddfe499c4d50366fb0b5a9b0ab177577b1ffc2c6a8a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 10856 bytes

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