Malicious PDF — malware analysis report

Static analysis result for SHA-256 573eeebc64ac5acb…

MALICIOUS

PDF

91.9 KB Created: 2021-09-19 07:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 846626486570a38f1a13badb35fef438 SHA-1: eda412a9d79c36a07aa66fe81ed0df75f2eeb580 SHA-256: 573eeebc64ac5acbbe4610e1f1ca9d46bee4154c6dd61de38c7ea08f2c280b46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=android+bug+bounty+reports PDF link annotation
    • http://euroteam.vn/ckfinder/userfiles/files/xugupinazabiritog.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/pasuraboso.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/tutavo.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/xadaforegaguvuvorofawome.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/siwakidisarizenaga.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/zedozevilogatanobidoji.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/83591873103.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/40039435356.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4f9d4800cd43e113bffbc3e4d4e8c414/1495650127.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demejusojogazamoloxin.pdfIn PDF document text
    • http://geose.ru/userfiles/file/88657700638.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378e388a2f8---59117674639.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/52217025952.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/xesege.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/81067952098.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/wifovefuxifot.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56454849817.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/nafufugasizadisa.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/52968160777.pdfIn PDF document text
    • http://gojjang.com/uploads/files/fijiwonaterafi.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/tiwigofevaxununig.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/46668802799.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/bokobanati.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_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 18812 bytes
SHA-256: 8afc787d627ac45dd466b4efc7073aef25ac8fc45d7c95563afecf42fcd068ee
font_01_sfnt_off00013090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13090 10696 bytes
SHA-256: 0938a5de21856c2ce7a299b6f3c23ea234a63ebe6215ddeaaf7a6fcb65c10535
font_02_sfnt_off000148d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1