Malicious PDF — malware analysis report

Static analysis result for SHA-256 85762f64ec77704a…

MALICIOUS

PDF

65.2 KB Created: 2021-09-23 00:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2b7822d2c1de8e132b91da8fb39c19c4 SHA-1: 2585b38839424d6f80ecc7b23573c849f6fd81fa SHA-256: 85762f64ec77704a368d450c3ea5b6e8224c1e41e933171b87ee31caeb818bbf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and the PDF_RANDOM_URL_LINK heuristic indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4355

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
  • 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
  • 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://autopsrus.com/ckfinder/userfiles/files/34021398311.pdf In PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021092304313236.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/voxivajuza.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/55114582762.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/51011732297.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/1365033042.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/lozidirerabelu.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/32481440728.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/58381230008.pdfIn PDF document text
    • https://choosetop.e-giant.net/fkupload/files/ginabojusigosobudo.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/2742663161.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210920_71AEB9AF64D0E512.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/10333609386142237e8651a.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/tinokebiworubukemu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5185f02fb1108c05614454c0fda017eb/99600670135.pdfIn PDF document text
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/jowetukodar.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/lopijusedavolojupibojavuj.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/11495198529.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/46178945846.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161427a8085ef7---91925005325.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/87150292310.pdfIn PDF document text
    • https://masihpt1.com/contents/files/15644409199.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/mapuribulapewak.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/648158443614b9e1e483ca.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bijoy+bangla+font+download+for+androidPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/zufesavel.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 10752 bytes
SHA-256: 307acf45a9e50d780934d6629f988d39ba0d365ec33c20a45581b5427d24b95e

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