Malicious PDF — malware analysis report

Static analysis result for SHA-256 daff9551e6046c1e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 13:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b32f5b033dfbfded159e9f7ed17d537c SHA-1: 0c0e6c5abe897c4cb85ade572677b817bf04558a SHA-256: daff9551e6046c1e9decd9cf2e77b163e1d2876696677f1ff5b2b16eacaf7656
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs, many pointing to disposable domains, designed to obscure the true destination and potentially trick users into downloading further malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pr-jam.com/ckfinder/userfiles/files/1548128574.pdf In PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/18080069274.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/pipupedateleg.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/gomopugaruzudipirex.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/bubinidufusapidifu.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/sezozaverodowijexumus.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/zemonetobiwavujixifuludox.pdfIn PDF document text
    • http://naviway.su/upload/files/bejoneregigumofuwitil.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/82568158200.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/kesifarekonanusima.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/60839554033.pdfIn PDF document text
    • http://lobi.md/userfiles/file/73100488890.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/juluzuvufavifelavamakirak.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/meforuxonubetojosoperi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134119f6d96f---58277472518.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/dusomuvagaj.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614185f544a39---77278850627.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/32493550046.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d943f87d---kowaregunokapukotijaw.pdfIn PDF document text
    • http://snsi.jp/image/news_file/kozulaxedelusuzarob.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/xominosobagedesakapamo.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/17581812284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+root+revvl+4+plusPDF 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_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 10208 bytes
SHA-256: 4a5aac9dd63a1d2bb720ae3335b02a538623e0ba30be5a5e88094d8002410665
font_01_sfnt_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 18016 bytes
SHA-256: 03509a29a28f2c50df9c642cd72f5e3b463a014ebc55dd9885cb5a2964db538a
font_02_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1