Malicious PDF — malware analysis report

Static analysis result for SHA-256 846580c5d1acd6e1…

MALICIOUS

PDF

69.3 KB Created: 2021-09-13 10:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ef44189b4479ff8a82cd2c128e5a776 SHA-1: 027dbb6ed0e20c9d2090a708130a80f5f6c4c495 SHA-256: 846580c5d1acd6e12ca2c85bfb5ef9a6d2efa3a53d4d8527a00d9e38746c1c40
94 Risk Score

Malware Insights

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

The critical ClamAV heuristic indicates this PDF is malicious, specifically identified as Pdf.Phishing.Trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests the document is a link farm on disposable hosting, pointing towards a phishing or malware distribution scheme. The numerous embedded URLs support this, with many pointing to potentially malicious or unknown domains.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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://jmtours.co/aym_image/files/98222624343.pdf
    • http://warehousetraining.ie/images/gutoposadipefapef.pdf
    • http://rld-carbon.ru/file/77070576360.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/25982608390.pdf
    • http://lumieretvie.com/userfiles/file/jotogizagimamojijotivi.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/84424122713.pdf
    • https://pasarangroup1.com/contents/files/46236693008.pdf
    • http://ranaghatpchsschool.org/userfiles/file/nedifojesobofenenuninuja.pdf
    • http://hanahana.vn/media/ftp/file/84056746972.pdf
    • http://preciz.com/uploads/wysiwyg/files/48598026158.pdf
    • http://udmvdpo.ru/images/files/7299776916.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6t27lu9jg8np6cshv1onjtqner/97313652102.pdf
    • http://ultrabeauty-ff.ru/userfiles/file/wogutapivivu.pdf
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/fofifejulemududonigefisi.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/61231657180.pdf
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/48652648194.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a7b4efeb---34894841595.pdf
    • http://ned.ru/uploads/files/59875914151.pdf
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/50634140328.pdf
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/34578806202.pdf
    • https://prawobrzeze.info/userfiles/file/80447496933.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/wusuvizujadazumuduxeniwu.pdf
    • https://digireg.nu/upload/71148478267.pdf
    • http://londonjip.com/userData/board/file/9124854675.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=quiz+android+application
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d745.bin
4cbc7b342774740f3186b5dcc4191000f327123d1a13604f0181bb8da9bbe3f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 10424 bytes
font_01_sfnt_off0000ef18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 16792 bytes