Malicious PDF — malware analysis report

Static analysis result for SHA-256 35449c50757bf2b3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 14:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1c072f73a6f5cbfd9142027979377a1 SHA-1: 0aabfe073110290e77b806158268d911178d7def SHA-256: 35449c50757bf2b315114c1c38e1eba7f73586ff710b73c4f5081bca2b69625e
146 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing indicate a strong intent to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=web+app+scan+barcode PDF link annotation
    • http://interface-referencement.com/userfiles/file/42068717815.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/5506888463.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lawuxafali.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/zanaki.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/98037910103.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/jularokugivudabulem.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/15796453611.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/79145477245.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/17711013757.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/kejakinudawixakugobekat.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/11/80646493221.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/43890188795.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/36277738714.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/fotewepiga.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/45201807645.pdfIn PDF document text
    • http://medica-brno.com/files/30100288862.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/binemiluzumulubifajof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130199fcca66---vewomiwemagodolujez.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143767162c73---5467056979.pdfIn PDF document text
    • http://armanetti.com/images/11481474054.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/jexesesawokoguzimisub.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pominowosif.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_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 17632 bytes
SHA-256: e531753a6f9f954ef2fcdb7f851a2b346b09eca0f2fa36cf987d4ffa39d2c4c9
font_02_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 10404 bytes
SHA-256: 71482bf67bc3d985cb3024ec5cf4004a526751ad5d5134646f38bb1da833eb19

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