Malicious PDF — malware analysis report

Static analysis result for SHA-256 3848b8635b6f5889…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 01:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bfe77182ec985f97075ec6019a41d997 SHA-1: 00ac266abef067af99c09c64dabb05f975ab818b SHA-256: 3848b8635b6f5889aa04bf8b1c2276de52ff67165744a8f488b4f937e1044176
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://studioarchterreni.it/userfiles/files/30873702278.pdf In PDF document text
    • https://morganmethod.com/ci/userfiles/files/63118972565.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/vawajisovokigud.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fexoxujoj.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/xopakenivokivu.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/gijijibalivof.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/xuvupiwufozagazirawumu.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/befonudanef.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/namijamusogex.pdfIn PDF document text
    • http://salt17.com/userfiles/files/silotesedovenuzekura.pdfIn PDF document text
    • https://beaszemin.com/files/38711286274.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/mebupinosizituwe.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/51518e87c112fad7527ae73352fbe46e.pdfIn PDF document text
    • http://usmleworkout.com/files/file/78364096799.pdfIn PDF document text
    • https://uudanbury.life/files/file/67486969226.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446fa686587---gepumanapalutuwizefenum.pdfIn PDF document text
    • https://shidoremicrosys.com/media/doxalilu.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/62726518364.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/70902112393.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/75416161992.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb481cce4---22030948981.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/98284595407.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/57264640367.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/97435649152.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/23160871065.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/jerib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mod+apk+assassin+creed+rebellionPDF 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_off0000ba79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA79 10636 bytes
SHA-256: ca6075b7ab93d0974d91989a4da9f61cb0fbc99fc2f754dbf68edbe5d1e096a9
font_01_sfnt_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 16016 bytes
SHA-256: fa588b2d0b3691e1010a0370af7daa2c2326e72210c8e4dfd4a3ee37760289eb
font_02_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1