Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da70f86ed0f1708…

MALICIOUS

PDF

74.9 KB Created: 2021-09-09 17:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7b13bd55d6be19ba9e7f79414b7bbdd SHA-1: 04fe43a22664bef36592caa1ea7da321e502ddf6 SHA-256: 0da70f86ed0f1708d2290dd1bde88597fac45add8c9214578356c8998d71b32b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable or unknown domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely leveraging a vulnerability or social engineering to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gamepinleri.com/calisma2/files/uploads/fabunivipurixumatuwumis.pdf In PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3910575571.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/83672409339.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/38451953557.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/30237743765.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/48016929387.pdfIn PDF document text
    • http://garderoba.sk/images/_file/vititenerupozimasakep.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/nuxujifilodexokoxe.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/dakexumetoli.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/83404663298.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/pevozi.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/fibigimesomiwadila.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/4426494354.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/zones.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133edba0cdad---5122432139.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/todidebe.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/suzivigupudusuvo.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/pivedan.pdfIn PDF document text
    • http://tcihk.com/userfiles/36632626470.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/relenaxiwowesemobegi.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/tinupoduza.pdfIn PDF document text
    • https://penal-garazh.ru/files/mitanuwe.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210906223353.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/54183216127.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/rekuvubariror.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=farmville+2+tropic+escapePDF 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_off0000c280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 16976 bytes
SHA-256: c3ee2db5b3c1ec33911b4c73e981de36a3adfe39354e2169da864c7dad8cbcf0
font_02_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 10596 bytes
SHA-256: e8857dd83936a1040cc7dcf91f01c97c787f9fd00ca632c153bce15a5f607e8e