Malicious PDF — malware analysis report

Static analysis result for SHA-256 76792d91810f38e6…

MALICIOUS

PDF

97.2 KB Created: 2021-09-19 19:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6469ea9c4b69f94e75a2f8cf81e86fc SHA-1: e8822a77fd2546e085ddc7c1b5e044a87e13296d SHA-256: 76792d91810f38e6b0b45f02f044624e34e4c3d688f782a2becd8f40a205a7b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to suspicious domains and file names, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://stcc-sa.com/motakamel/Ups/files/fogosikomivorewumexo.pdf
    • http://faradbox.pl/files/file/21986283988.pdf
    • https://ppntassone.it/dati/upload/file/81288251641.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/47ad1645bfd2c0b4b32bf3371f1418d4/ganaf.pdf
    • https://euroialinsol.ro/userfiles/file/xokebejowuvawosopajitufi.pdf
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/vesiwusumemozuve.pdf
    • https://warsztatgdynia.pl/app/webroot/media/files/28710713853.pdf
    • http://ipai-bg.eu/img/file/numazobawado.pdf
    • https://jmcoverseaspvtltd.com/uploads/files/25816452305.pdf
    • http://thuannam.com/image/files/vuvedisufun.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e2c73220---23978532710.pdf
    • https://capitalsyndic.com/userfiles/file/94172706386.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/lopopakivameverunozigi.pdf
    • http://centromp.it/userfiles/files/98882401584.pdf
    • https://kapokcmassage.com/uploads/files/202109031135331658.pdf
    • http://www.firengo.com/userfiles/files/bupukulerezubemukut.pdf
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/tugij.pdf
    • http://hanabi-la.com/uploads/files/patitimekirez.pdf
    • https://tavio.ru/files/file/buwat.pdf
    • https://dgssu.com/upfolder/e/files/20210903105621.pdf
    • http://vetranhtuong.info/luutru/files/48001728705.pdf
    • http://gniortho.com/files/Upload/file/58635670726.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=engineer+code+android
    • 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_off0001125a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 16792 bytes
font_01_sfnt_off00012a71.bin
4948f1ae252f640df121848e780c49a0716be1f6d6515e35e0bf92a3d6f01b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 10216 bytes
font_02_sfnt_off00014131.bin
e587333ed107b8ca0aca676a77605e5cdec3cdfdcda6f52880e4321d22086728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14131 20148 bytes

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