Malicious PDF — malware analysis report

Static analysis result for SHA-256 106626aabc3a5078…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 20:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44c2cd2e1c3cfdc9c655aa743280b6e8 SHA-1: 50e0072b852e0d4b7f15e0ad57cbe065ad01757f SHA-256: 106626aabc3a507891c7b461d44e2c4f8e8f929cc3b175e52b5fe08510fce6a7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of hosting links on disposable domains. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7066

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://ketchas.ru/uplcv?utm_term=check+apk+signature+online PDF link annotation
    • https://triosms.com/userfiles/file/xesetelipanawalusobofida.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/41280882241.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/rujuxagipopogevudu.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/73883861436.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/zopepef.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/97458189696.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/zirilarasozudevimotuxej.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/lolabevivofofuripur.pdfIn PDF document text
    • https://koratspring.com/upload/file/kezadavakejusokaf.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/jukasok.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/zexamesesodatoxikigek.pdfIn PDF document text
    • http://kammed.com/userfiles/file/26865597063.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210912133031142091iy3dzv90wngd.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/tebinofeberawabegado.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/42924027263.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/45748440258.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/58037871675.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/89188850946.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/busajodagazukup.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/memegolotuso.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4102570d6---pazopudavura.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130528924f7c---satutax.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/dosaxavivuwugutiwazibo.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_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 17264 bytes
SHA-256: 4141f1300c7e2427e30eb335c9f406542fa1557600cc8bdff0c931dc0c281d44
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 10876 bytes
SHA-256: 3338c26815c18a09e16e712ae233b78b1f88f971b5968f30ece7d7156adb6a4c

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