Malicious PDF — malware analysis report

Static analysis result for SHA-256 350f8367e5ddaece…

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 16:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c4537f8c411d0587e3b8130cd8ff831 SHA-1: 32393e387a3f4622c2ecbe157fb244151c88b8b0 SHA-256: 350f8367e5ddaece26d651c31b22eae362fc4e6b600d74a3b8db161a8fe68446
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical ClamAV heuristic indicates this PDF is a phishing trojan. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of many external URLs points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

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://chcial.ru/uplcv?utm_term=android+tv+box+black+screen+on+startup PDF link annotation
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/30759389630.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/wejudajiborufijevenejep.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/jizanuvogojunatagukipudo.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/91020989889.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/83597001031.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/zugufakenufexeretuveno.pdfIn PDF document text
    • https://izr.fr/files/loradudiwob.pdfIn PDF document text
    • http://peoplefoster.com/pliki/malix.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/medid.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6290024765.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/76045037129.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/160416224108.pdfIn PDF document text
    • http://vuason.vn/upload/files/wufopenijogiwitefifikija.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/dufalasila.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/73566156964.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/winodaxim.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420096996eb---vozotupotawijomurezo.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/kujilesulebix.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/99156695821.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/97170733593.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/54812244936.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/17250938845.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/82231164420.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/tubinenivik.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/tifefugoxabolujopanasipa.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_off0000d951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD951 10988 bytes
SHA-256: 08616c9842629914a350883faec16f2a25e5cfee952a265155b733f54bd6202d
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1