Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a681efaa1745503…

MALICIOUS

PDF

64.0 KB Created: 2021-09-18 09:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 415f3830ec2de9033781b4db7bc29e07 SHA-1: e784049defe61d90903c70d25b2b940e040de0e1 SHA-256: 3a681efaa1745503df2c0333155d318b7ec1cbeccb88098ed7c3cb2e08b65462
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the phishing detection suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

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 http://maryalo.com/userData/board/file/91699296580.pdf In PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/renemiguzuzakifenowozadeg.pdfIn PDF document text
    • https://yifff.se/userfiles/file/kuzotirekilibubufanoka.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/fowurozoruverulu.pdfIn PDF document text
    • http://ranchobg.com/img/file/89180558585.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/fipepatemiwezod.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/79303520382.pdfIn PDF document text
    • https://curvy.tw/upload/files/1102878934.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/tifipenetapewilotabube.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/peborejiwuzopixegu.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/nutowatoxidonexaji.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2567f4cd---gojepakibunafojeseninivob.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/51041293827.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/30701994113.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/57440099959.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xefuvadivu.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109110103442387.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///47854957163.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/mefujonojavisot.pdfIn PDF document text
    • http://webs123.com/userfiles/file/44110882950.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/tawavifitasisotef.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/67696378783.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/memorogez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=reset+samsung+galaxy+s4PDF link annotation
    • 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_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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