Malicious PDF — malware analysis report

Static analysis result for SHA-256 82646982cd71ca80…

MALICIOUS

PDF

89.6 KB Created: 2021-09-21 16:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e237ee0f8984f1beb582958c648736d SHA-1: 8a2bef2fa8a7f4359ca550c02bbea466e7c0d703 SHA-256: 82646982cd71ca80718bcf74964202da959942aad4a48a2707beab1a82c24cee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the presence of external links and the nature of the detection point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=programa+para+hacer+aplicaciones+para+android PDF link annotation
    • https://srmhomes.com/images/bulk_images/files/50709071773.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/nowisigulukitimalarurupi.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/94273905173.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/84685430747.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2ehiipru13v2mqs0pqu24ce5r1/22979839766.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/saxiliwotuwazevulorazin.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/99189555338.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/jarusap.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/kalujepif.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/pasavukopirinanubatobowix.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/4847447905.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/14874466084.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/9400981608.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/10724183051.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/68438019650.pdfIn PDF document text
    • https://ibextrail.com/editor-images/14148181615.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/menukoburofi.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25317220550.pdfIn PDF document text
    • https://advik.net/userfiles/file/fopajiwofosilulela.pdfIn PDF document text
    • http://chayka-svg.ru/files/majanumoz.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/pejilidiperoz.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/82186801369.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_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 10864 bytes
SHA-256: 0de315fb5aa9f920f60e7f6b2b8877b2d84bb346adcedcb4c84238a01077cae2
font_02_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 18644 bytes
SHA-256: 299630d30c091eaa529ec042801f26d1ee1ae824c479cf3ee9aa7dce558baade