Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ed26ec30903aef…

MALICIOUS

PDF

62.6 KB Created: 2021-09-09 04:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d63bd9ebb89f15f621b45ef4d97f36f8 SHA-1: e154864493067110fe8977d725017ec264125e55 SHA-256: d6ed26ec30903aefb6b609b9309dc4f4469ffa0d84086c4a0755abad14a1b8c0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL pointing to 'crewmak.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to distribute malicious content or phishing lures through a large number of links hosted on potentially disposable domains. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8256

Heuristics 4

  • 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
  • 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://crewmak.ru/uplcv?utm_term=jora+10+numbaria+full+movie+download PDF link annotation
    • http://ideviceplus.be/app/webroot/files/userfiles/files/34875850719.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/jefivik.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/joritunagizafituxegiv.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/39033675359.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/85158488563.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/65890214527.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210908165045256.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/19738696002.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/86608090802.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/89249201146.pdfIn PDF document text
    • http://bankerz.in/qpic/files/rufoxizubax.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/11277784044.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/64081638641.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/36516866707.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/84303767779.pdfIn PDF document text
    • http://qwerty.pl/_data/file/zinine.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/nuwowavif.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/wobafowovidedoweluf.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb8b45fc7---77545673550.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/89126255198.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/17702545350.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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