Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e991cd25f4a3d9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 04:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1e405f73645dff77b4c5fdc029a7e0b9 SHA-1: b0c958679f0dbb3afcef89ea6b239d757a475372 SHA-256: a3e991cd25f4a3d9b4811bf240f3866782569c52a5af9ed1ac4569de8743da58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to host malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on potentially disposable hosting. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/rufofada.pdf In PDF document text
    • http://tlxzkj.com/uploads/file/090427491756.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/zemolotolusejenifodag.pdfIn PDF document text
    • https://plasy.com/uploads/file/70733555254.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613384d1d4660---nudefisoxamipofadojubik.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/xelikedugal.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/dugebojuxofutafugepe.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/83701212194.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/64450550157.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/nevege.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/56039235074.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/46419892568.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f694e62e7---13775058900.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/37544525412.pdfIn PDF document text
    • http://eva.am/files/7ac0fdbd0580c5e6.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/3572435627.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/77088027905.pdfIn PDF document text
    • http://net-marketing.hu/images/files/99043318630.pdfIn PDF document text
    • http://ingore.cn/upload/files/vezimikevoxovomikodutipa.pdfIn PDF document text
    • http://identik.hu/editor_up/76531621804.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/59054292455.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/26490985952.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/33015953258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=moving+ball+back+in+stance+with+driverPDF 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_off0000be26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE26 11028 bytes
SHA-256: 4e8887f65e414190aedbdb8eca9262e1bf5d8f4823d54bb2d4f30ce7f55923d1
font_01_sfnt_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 15820 bytes
SHA-256: fed660ea7bcdd63677256bda7c7722371a9da93ce1b9805ecf485c055b15f5be