Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3c84cd50a2341b…

MALICIOUS

PDF

75.4 KB Created: 2021-10-06 19:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 11afa3cc2c7b8f746c421d2e8a6f7302 SHA-1: 2744ba9e378cabac7df70f5886241f1f5bac2474 SHA-256: 7e3c84cd50a2341ba7d8c9bacc8c27dc59bd783055dc94d8fe5346d517ad5d68
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which appear to be disposable hosting, suggesting a link farm or redirection mechanism. The PDF structure and embedded content indicate an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=hounsfield+tensometer+can+be+used+to+perform PDF link annotation
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/tugirelijirazadoxuw.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/43708216559.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/ligivamobise.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/lidilelot.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/geguxixevixabakejaweditan.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/79769016979.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/1948597605.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/lulijebifejisolupavonibux.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/90715977595.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/nizusadosizoxesozodi.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/tasapegokonuxarugufa.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210919115014_6olxwd.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/30772518719.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/82078648738.pdfIn PDF document text
    • http://zenithmetals.com/files/gudabifine.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/78943698297.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/zumizuliw.pdfIn PDF document text
    • http://thuannam.com/image/files/20348420905.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/robaxuzi.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/ziniliraxije.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/negawexi.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_off0000bf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF17 18432 bytes
SHA-256: 1314e7772e408dcd143dc5e484d251719109938740beaad5b03fc8e956d6e893
font_01_sfnt_off0000ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 11012 bytes
SHA-256: 6d518e32a7bc5a703ab770b8738bfe2c90238a64498977d63b2ae1ee727555a7
font_02_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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