Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2216989a5c75aa…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 09:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 73d1dca13f8842bb71446b2d90b90f71 SHA-1: 9798e1d19f30e6353b644793486d2a8ef653b9ee SHA-256: 9b2216989a5c75aa386a504f0fd23d692dd2b9f3b3d69dbf2009266ead46c36a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDFs hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates the document's purpose is to direct users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://naszemotyle.natura2000.pl/imgturysta/files/mebegemitatagex.pdf In PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/paruzevelepi.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wokikuzofodimusebawino.pdfIn PDF document text
    • https://phr4u.com/files/64343189275.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/wamonamugubezekugusuka.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131839da57b6---bamukozo.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/60566794032.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/kalubufotewuvexa.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/29930486501.pdfIn PDF document text
    • http://candientushinko.com/images/file/lukofowenumivi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/ketewovifule.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/vitumufozalogemebosumum.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/86882618766.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/suvafozirones.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/saletetaba.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/91139145703.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/36322454537.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/pipurigapuxejote.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3640df08---dobezaxigaxi.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/37166922203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=picsart+mod+apk+latest+version+2019PDF 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_off0000b098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB098 17792 bytes
SHA-256: 9c9dbf8a89a30528992f088fad88a7234d8659500f4919161ca698fee825f10e
font_01_sfnt_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 11296 bytes
SHA-256: 124794960885b468cc5dff0484a4afdef481026ac1a89100450251c66a95e78f

Open this report in the interactive analyzer, or submit your own file for analysis.