Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae552a77cc91c60…

MALICIOUS

PDF

70.3 KB Created: 2021-10-08 18:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7af4bf49bbc0cb76bc7ed3b1194e8b93 SHA-1: f7dc6404105611d65bd82f846b7b4b8a10e7e912 SHA-256: 3ae552a77cc91c6098ff1a80b54fa4535bf63df4d9951541ffeebbddd10bffcf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8157

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://cructi.ru/uplcv?utm_term=assassin%27s+creed+sphinx+riddle PDF link annotation
    • http://tonwen.org/userfiles/file/35473232159.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/66635194409.pdfIn PDF document text
    • http://fetogram.com/images/upload/files/sezim.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614141565acc2---38358247555.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/56847824942.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/28515442114.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/zozajorada.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/61405734641.pdfIn PDF document text
    • http://huefpdf.org/upload/file/zixovuxoj.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/50581647399.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909090549.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91c2138f5---dawefabulane.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/97456146491.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/gekibafatanusuxafifoma.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/99689451398.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/83693376895.pdfIn PDF document text
    • https://istanajp.net/contents/files/6050924044.pdfIn PDF document text
    • https://alpinashop.bg/files/54456123331.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/kusinoritemegi.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/34217940218.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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 17172 bytes
SHA-256: 3f4364e4f4fa078e4b815e82ff3b80a7fa8bab6c4195add77da01537dc19087f