Malicious PDF — malware analysis report

Static analysis result for SHA-256 b767f68ae7ea8aa5…

MALICIOUS

PDF

75.8 KB Created: 2021-09-24 11:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6eed790b9e91368b3c8b2f99ec805683 SHA-1: c2b1a0ef8092984afb7426838958fd474c97aafa SHA-256: b767f68ae7ea8aa5956d9fbe9f635c42fe7d1b52d488944bc7402df618520f77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or spam. No scripts were extracted, but the structure and URL distribution point towards a campaign designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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
  • 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 http://keralatravelpath.com/uploads/file/87561316956.pdf In PDF document text
    • http://cbcom.eu/ressource/site-image/files/fanevatureso.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/nefojesezixelelil.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/25811301979.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/39737549609.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/tukozaxigipemaburelarob.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/bonaro.pdfIn PDF document text
    • https://reha.bg/content/upload/file/pijizepilajemiv.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/29081461297.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210914_D44BB85EC15DF14A.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/xejobugusovezuxemiluziwel.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/vawigujazusizepoxil.pdfIn PDF document text
    • http://zatacorp.com/upload/files/62438217536.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/51583353116.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/18317156924.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/xibumajemenexawater.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/zolemijefutir.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/15538237339.pdfIn PDF document text
    • http://machulski.com/public/file/dibivefo.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/78506532895.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/jegif.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/nobl1fp0mv2d7d2qobr31eleo2/ginajururiraxul.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/1882810b084c86512d99618d316a6f68/mujizilal.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/sutigexupanirubuwenin.pdfIn PDF document text
    • http://metallpress.info/files/96485870124.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/83972547007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fonts+pro+apkPDF link annotation
    • 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_off0000c03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 10044 bytes
SHA-256: c6fccf7b5ca317c89ae682553be2336dfb02ab4ec35e2afa41070f9f284a9a3f
font_02_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 19532 bytes
SHA-256: 73239755b46a6924ae6e04f609662f7263e9895a6fcd7e54a2290d687a9f6fdf