Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f0c274e550d33b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 02:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb5d6cc473009ab7942ca270a82c6cd2 SHA-1: bfcb041b61cd49db60cb46daadf76b5a243932a4 SHA-256: 63f0c274e550d33bce6ae5f43c3a491d903451ebfe9fe5de63176f74aab3d00f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The PDF's structure and the presence of many links suggest it's designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://riversedgefm.com/files/file/paxifa.pdf In PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/78026745493.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/xagotobozinukebiminanut.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/rizivifuwetobon.pdfIn PDF document text
    • http://domplus.su/userfiles/files/towuvigalomaguto.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/13731302734.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/21599905134.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/88873949743.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/rafitabefugufegepenowozeg.pdfIn PDF document text
    • https://everestart.com/images/stories/file/30267964835.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/rufajanilomomipe.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/53414280937.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/dukepijapokevuz.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/33755262009.pdfIn PDF document text
    • https://rjpexport.com/files/wademotupo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b735e5e818---27755628976.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/24433971396.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5ibojpae3tbcn8som4cdhpbb65/84286150213.pdfIn PDF document text
    • http://wenxuezj.com/images/File/sujiloketudinalezanag.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/88439232465.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/davuxewebavopuji.pdfIn PDF document text
    • https://airxps.com/userfiles/files/xativafolepojagabipusoref.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-16/20210916105155666653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kingroot+root+apkPDF link annotation
    • 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_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 22728 bytes
SHA-256: 783500955ad99c57fdf81da383cdb73ca4038e0c20c02218923c3a948b82a672
font_01_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 10164 bytes
SHA-256: 9de3b67b47371975d29b7f924eb42816c4719cbdc743e33a4de2736cb53b6372

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