Malicious PDF — malware analysis report

Static analysis result for SHA-256 f864ef887414d544…

MALICIOUS

PDF

93.2 KB Created: 2021-09-21 23:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed999705cb0472ad9b84ce195a52be22 SHA-1: 88996ad164b6cac8f1f1a66e1b0284d74a4340f3 SHA-256: f864ef887414d5446208fd3e5dc5ae1a0647ae7b8fd4d6e0f799fedb7e730acd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2ae762bda---14028182865.pdf In PDF document text
    • http://sujitonweb.com/userfiles/files/bipuwerumegoroxukojofepu.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/48776148725.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/rukelaguvalov.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/lamokepurawenomaj.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/sujuruxagep.pdfIn PDF document text
    • http://pileki.com/imgup/file/vivuked.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/11348658877.pdfIn PDF document text
    • http://bluebossa.pl/files/file/puxumupalotezitadonuris.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/73654105575.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/kovafikusulijetokizon.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/99289028814.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/78520464691.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/76902394942.pdfIn PDF document text
    • http://htwy.com/upload/file/6845138358.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/26339913687.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/palewutefevijipinuko.pdfIn PDF document text
    • https://kokomanis.com/contents/files/13996160450.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/wimedokotez.pdfIn PDF document text
    • http://lawngo.net/fckfiles/26448593367.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/4062806941.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/26267827129.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/xomajawukipimunuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=123+movies+online+free+streamingPDF 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_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 10872 bytes
SHA-256: a10add1ae3f1fa214258159ab5ac5da97a7d0e2fd7421c5d5ac1fcd666da91fe
font_01_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 19316 bytes
SHA-256: a8ebb51551806eabee960e7b977ee1ef78076a839792b8f8e4ac9b9ae04acef6
font_02_sfnt_off00014f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1