Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca34133aa3219ad8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 02:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd615eb53d67d782b278396c2987c2dd SHA-1: e2a9bf47e6da79578db0635cf9ec1e372179b3df SHA-256: ca34133aa3219ad8bd9eb02526e0894a9d196090b094e90d44ca9f4a18b29f8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The presence of external URIs and the overall structure suggest it's designed to redirect users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=minecraft+premium+download+android PDF link annotation
    • http://assessmentinsight.com/ckfinder/userfiles/files/79571117425.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/wavop.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zalufetumevuribipuni.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/sebixonigip.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/gevomafenateziso.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/kezaxekutonuruferaz.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16136efb2036ce---3048539654.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/34663354776.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/82730222837.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/89797989971.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/27518374932.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/wizalefidasaxu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/l8oaa30u2485qhupeeotbrn990/dumeguxazom.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/vijidaxaw.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/xegegubewamazemidinobe.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/nemapujimarutebezezedozis.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gukofepu.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/fosemevidami.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/vimapobuvalolukijelosabol.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/maganigonamolinukodoxoruz.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109051250074382.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/30393613268.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/lajojesofezasobozulofi.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/79245242006.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/10677057055.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_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 16744 bytes
SHA-256: 846eb3742711449d92dbf9d05f24c489661b0b0abe1fd3eb934502973f118096
font_02_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 10792 bytes
SHA-256: eea836e297960cc11878bd0ade640c5bb1e3f2db8e2e617587213a984e4c85ba