Malicious PDF — malware analysis report

Static analysis result for SHA-256 586751bff6b95e6f…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 18:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b424c49f26442302ad91c3736bb829f SHA-1: 8567071f43472829a0fb592ab46b2443105e9d36 SHA-256: 586751bff6b95e6f895398fb6737c66e7fb03f3a91f251f76c39f4144a41583f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135118a201c3---66782514262.pdf In PDF document text
    • http://intertribo.sk/files/nizutipexidoman.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/kazulamino.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/19660926495.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/zovalojudizujunivegutan.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/26102511853.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/somaj.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/nimexuratilimilajote.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219331057.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/48928662556.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/56866777413.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/66178988997.pdfIn PDF document text
    • http://sushibelovo.ru/files/jemutujidenuditenus.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137065960f54---83465519306.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/rodozutekobarali.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/romuwekenebef.pdfIn PDF document text
    • https://unosms.us/userfiles/file/50511937702.pdfIn PDF document text
    • http://melabo.com/upload/files/21741660649.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/kukebetigibubavuja.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/vaxeketebolex.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210908040624644.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/firibof.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/44925820812.pdfIn PDF document text
    • http://classoft.ro/userfiles/file/wagubug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kotak+net+bank+rtgs+form.pdfPDF 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_off0000c668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC668 10992 bytes
SHA-256: a0696b27ece341afa25fe44ad0980bcdf1a4861b22172287f524cd4b09db81bf
font_01_sfnt_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 17948 bytes
SHA-256: 285512ea942144db7bc82bfbbf2c13fb70b1f57144122de9ab2bfb06725e2105