Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cfc11afbba8539…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 10:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8927f30195d02f10d3c2893078876d4 SHA-1: e065b886a46e77dc65a4e771642bb4bafb7767b9 SHA-256: 65cfc11afbba85395d69989f0c595eb0f4f23c6b5b677b2b5fd6d175b88e3aa8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to link farms or disposable hosting, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the overall structure and URL patterns are consistent with attempts to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.prieteniitehnicii.ro/documente/file/talejivurudobuxebax.pdf In PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-12/20210912000314911485.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/45006395795.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eec002f65a---falolulowakalafelewagomiw.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/91428653050.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/ledetupulivifevene.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/baritilazaxezuguwave.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/43258765432.pdfIn PDF document text
    • http://kaies.net/upfiles/210908191228293712zeyjax.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/93884467988.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/janidafajadifebepez.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae66e5aaa---37175617972.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/66392062985.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/62349558642.pdfIn PDF document text
    • http://dr-temt.ru/images/file/mawabojemufurewinojixefu.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210901215329.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/razexemu.pdfIn PDF document text
    • https://cubic.is/userfiles/file/ramurajokuju.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090922203480554.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910051902.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/86044147447.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/tutaga.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/54844531275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=granny+horror+game+download+old+versionPDF 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_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 18692 bytes
SHA-256: f33a0bce29be450e8be7af9490e25ec7a797d6b79326e06aec0c764f686d2444
font_01_sfnt_off00011dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 10904 bytes
SHA-256: 79dcec156283d59f6b8702fd0d1e830e0de1755847fb7aca9e0257131a327013
font_02_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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