Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fab05286aa026f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 14:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6483d4f33bd7db283f2ce7bee7750805 SHA-1: 57fca0982ff7a460f9b8502629cde41f31e25ee1 SHA-256: c8fab05286aa026f17dc9529ccbd4c43abee9653af16ee4b01770fb63b6c5d65
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://madinagirls.com/easydo%20v2.00/files/uploads/lewemivafedezepebiditex.pdf In PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/tediwumutigefefijeveras.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/fatagaromisowepapobuzum.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/resubibeno.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcaa602b0b---73579490956.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/mepafopibagan.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/sinisigajoxo.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/jutiwuz.pdfIn PDF document text
    • http://epmachine.ru/d/files/46196209036.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15644171822.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/vupuzamadutumigilur.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021931819277271.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/14063775495.pdfIn PDF document text
    • http://novichiha.ru/pic/file/galejogidala.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/55581277686.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/deradijaludeki.pdfIn PDF document text
    • http://www.siposferenc.hu/html/42002070742.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5q2bqdt2o4qjaqkp5qkmo2a7n9/33555299262.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/52075984703.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/boguwefowulojadiw.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/23390896537.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/nuvirozeditifeluxilowi.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/31168479119.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/82153116400.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/58908168431.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/95888655616.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/xuwozivep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=polaris+premium+apkPDF 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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 10404 bytes
SHA-256: 904dc891e2d0ec40ea0b94e0459cddece487e770a8aa90d22af3b7b1600c6d33
font_01_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 18920 bytes
SHA-256: 8cd2148a379d354558d3e17eb8c9f702c09b4ebb31abb86ed563015a16ed0959
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1