Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4878f04061bbaa…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 09:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4f41f782b9e70983e537f89b84acf4eb SHA-1: 8f11e807b9c818053cede5bc7047160e536d78dd SHA-256: 6f4878f04061bbaae8871cd5673ddab33d543cd5551c7e59089c800c38e23764
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://urdu-hadith.com/survey/userfiles/files/53264742876.pdf In PDF document text
    • https://satellietgroep.nl/userfiles/files/34932639156.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109071251163705.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/3507373617.pdfIn PDF document text
    • http://fluorescent-training.com/file/6069502387.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090819224985.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/53087583195.pdfIn PDF document text
    • http://spakimthi.com/upload/files/xodes.pdfIn PDF document text
    • http://newshop.jp/archive/file/44712295054.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/mirezolokewet.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/kewobigejav.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/funizefenoz.pdfIn PDF document text
    • http://lagrupacio.cat/file/kemadi.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/megoladeligemuvuveva.pdfIn PDF document text
    • http://dd-eng.com/files/files/lawufoviruzaputekuvu.pdfIn PDF document text
    • http://seto.cz/uploads/81158889755.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905010524941.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/maxogabufosabekanoxeto.pdfIn PDF document text
    • https://nyig.com/files/file/33970990183.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///32216360013.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/balebdujqu08g05uveees21b6p/6806395525.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/xizudikododisupetokef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+change+my+ringtone+on+androidPDF 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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 10792 bytes
SHA-256: 86d2c9af455379fec76e5157ae639d5cef70d01fc2a535368fb877eb3dc461d9
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 17740 bytes
SHA-256: f1cd0f583456d9e87435f5e550e5eab430cecfa85f32a4902a448ac78dbb3224

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