Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fbfc19231eff17…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 00:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 0ee3f63195d5645ec2bd980477a1e5b9 SHA-1: 3a1267008110a3e4ec4eb7d5decd06eb09435862 SHA-256: 65fbfc19231eff179fceaa01d6b030dcfec50bd259c928b40dfe0225bf641b1e
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=dolphin+zero+browser PDF link annotation
    • http://www.verneteco.com/ckfinder/userfiles/files/fezoditinezafe.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/wikusogifulabu.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/44029940996.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/dirudutix.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/94884884971.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/gevewelidoxodajel.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/30520431251.pdfIn PDF document text
    • https://rubfila.in/files/file/pafenonojikem.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/xedifixalimofid.pdfIn PDF document text
    • http://sinostandards.net/upload/files/67990253378.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/barujex.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/67740387770.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210912_54A48D7E3BCD25E4.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/94052373700.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/82614403228.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/xidej.pdfIn PDF document text
    • https://ags-car.com/upload/files/99845911514.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/xozojejagesewop.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/26637622506.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/nakudadodusubamewamafid.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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 18316 bytes
SHA-256: 81191b8c4557521d7aa640a0887cadfab7cf1edf8438f741c6f04bd945760189
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 10376 bytes
SHA-256: 05da25a5b4b19cd59f1a8060fe68cd5a012066955242ac1927724cc95f010958

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