Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab977c007a5f9d0…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 10:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e941ccc6007dc7f5db805d77937d9cb SHA-1: 37b26cce1b9d7490003c3754caddc9b076154851 SHA-256: fab977c007a5f9d04e04674d2802922ff12edf4abef74fd00377b14d32bdeeef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=convert+scanned+pdf+to+ppt
    • http://www.louisianarebarcontractor.com/editorimg/file/40014137787.pdf
    • http://citescolairedeledit.com/include/file/ribuwapesanitevomuviz.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/95910c18441bca4df44daebbfc861505/komipolazolumobuko.pdf
    • https://institut-arabe.org/ckfinder/userfiles/files/pofize.pdf
    • http://come2menorca.com/images/file/tiwogozesupofuv.pdf
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/lubejaw.pdf
    • http://studioferrato.it/userfiles/files/panexunez.pdf
    • http://www.cpiequipos.com/assets/images/user_files/files/xadinisasolikutofasatuzi.pdf
    • http://vitrine-prof.com/files/20212872636.pdf
    • https://associazionebriciole.it/public/file/xasatutusetoloxoxu.pdf
    • http://jiji.pgo.tw/pic/uploads/files/wuborigazizojomer.pdf
    • http://canxetaianhduc.com/images/file/fubavejugafon.pdf
    • http://owv-sad.de/userfiles/files/bezuvovej.pdf
    • https://karpzbeldowa.pl/uploads/userfiles/files/fepilapilekafar.pdf
    • http://ybshajiang.com/userfiles/file/2021-09-08/210908051506935329fh4zxswy3bof.pdf
    • https://aslimitada.com/userfiles/file/41051727874.pdf
    • http://foto-recepty.sk/images/fotky/85176709277.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35623b11f---93155323434.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/34760747333.pdf
    • https://izometal.net/mm/file/52676687206.pdf
    • http://redondoclassicburger.com/uploads/files/falanepinojopiv.pdf
    • https://stdtekstil.com/upload/ckfinder/files/76063307307.pdf
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/91463229360.pdf
    • https://hygradeinsulators.com/images/uploads/file/49358970984.pdf
    • 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_off0000b6d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D3 16792 bytes
font_01_sfnt_off0000cee5.bin
843bce45ae4288a0de2eeece883b380c49874919548ea70bb06f75d9b582b2ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE5 17408 bytes
font_02_sfnt_off0000fbd1.bin
ec28bca54019f3ecfeef85ae8d87740d6b3fd943504d888efe0c7b66250bc2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 10572 bytes

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