Malicious PDF — malware analysis report

Static analysis result for SHA-256 627fa5cc2c66e6b3…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 11:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4ff4d1c801b1e8f366ec4b4c81d7dc3 SHA-1: d7cbab9398beb090a9809ef1467645f81b038e81 SHA-256: 627fa5cc2c66e6b32ca9fed6f3fdae8de4543b73743ed745d6b29b0cddc443a4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to domains that appear to be part of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior, indicating an attempt to obscure the final destination or distribute traffic across multiple low-reputation sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cctsw.net/whly/up_files/FCK/file/20210905_235555_157.pdf In PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/34444081515.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/kotudekoxawimaxorif.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/38528770897.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/tinuvixusak.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/67740691351.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/liwefuzome.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/20825210380.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/fakefusal.pdfIn PDF document text
    • http://slovoveri.org/userfiles/74401620237.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/86279835144.pdfIn PDF document text
    • https://landviewdesign.com/userfiles/file/jagatev.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/11784584339.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210907_DB9F135A0EB58ACC.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/dovadutigafavelaz.pdfIn PDF document text
    • https://ewt.cz/res/file/75288951719.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613100ca5ae0d---fusokesuzomomoladuf.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/g2shg92ps8ujlutrns588oeus3/48701047696.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/pewiworopopagariteniruda.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/pawubomawenosogepobubi.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219215295858.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/46090741283.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210911210202_u5ruou.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/92221047299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=yes+watch+onlinePDF 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_off0000b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 14348 bytes
SHA-256: 80f289b5892e12681a17d537c2c8c20ee5cd64e8803a2145f0dfdcfb919b8b3a
font_02_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 10296 bytes
SHA-256: b6103a63b5fffb5c1d6dbb97cc66895e6bd113da628c51cd4ca4b699fec28293