Malicious PDF — malware analysis report

Static analysis result for SHA-256 77279dfd0ade9e5a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-21 13:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c961126c259f24622b684033d6d1c3ee SHA-1: aabc785b12ab2baf61b510f655d107010d8b25af SHA-256: 77279dfd0ade9e5a6d70200ce86bc928b4a4191a6a98efb754a6435b577be464
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or credential harvesting campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute malicious links across many low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://krisoc.ru/uplcv?utm_term=brother+of+the+year+full+movie+eng+sub PDF link annotation
    • http://areaengineeringsrl.eu/userfiles/files/85965779149.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/nuxelasita.pdfIn PDF document text
    • http://dsagco.com/Upload/file/36050967455.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/82481338871.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/kivakenurizajusex.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/51154931813.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/75452023828.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/lulofivoku.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/97136058466.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/19951860539.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/tonajamazewolutigawoli.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410ec7073ff---sivunazelavotixefupuk.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/32985955330.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/ribunafir.pdfIn PDF document text
    • https://norservis.cz/files/files/zukuwiferaxof.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210906_194519.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/dajadeb.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/61501198710.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/64877754006.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/davukerukira.pdfIn PDF document text
    • http://irollee.com/userfiles/file/46349946565.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/74377252670.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/bigarakuwikabolaw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 18148 bytes
SHA-256: 26946c6b3ee7353f109068a4c84368eaff27a864d8a326033e622d2c27fc9c9a
font_01_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 11136 bytes
SHA-256: f6dc52a8b76de62b513d788c479aabb46097d3d9f32f9a9a58f63dc3c225e51f

Open this report in the interactive analyzer, or submit your own file for analysis.