Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3695a41f543e631…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 14:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9c19c7fa5a5b355e4645b0078a4039e SHA-1: 1fe57717eab2040028760d1f4059a869e700e933 SHA-256: f3695a41f543e6315f2c8a4b507195bf9b400b5c4b0e7876a4935ab005e30127
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm designed to distribute further malicious content or phish for information. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ascii.tn/web/cgi/file/96193518967.pdf In PDF document text
    • http://pnmanagementsolutions.in/uploads/53312251697.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f10b2ccccf7290182f5469986710b56f/jukirar.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/58974229707.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/jodakubaga.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/riwokuzopegufuxojawafefaw.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/4232860027.pdfIn PDF document text
    • http://cocoal.com/uploads/file/nigijo.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/6665305362.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/42082761063.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/67520136482.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109100318316805.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/xasetorojam.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/mukab.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/20805151573.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/r3eni2aakrls017e2moo5e9grr/buneneduruli.pdfIn PDF document text
    • http://chikatere.com/Upload/files/3138376490.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/regafupataneno.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lebeliregejafazolupu.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-2/20210902051933168697.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/52362699262.pdfIn PDF document text
    • http://sdes.in/uploads/jerenodufebisugewabifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=deep+deep+waterPDF 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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 9944 bytes
SHA-256: 3755e7b015b73269743bc977bbfcc9ab22b46ec364a8dc81709acb0737bdcb6f
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 16520 bytes
SHA-256: 03d2b1ec3bb0c3444b6b2820bb297c7e69d125e743ea6a84bd48f2727256b287
font_02_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1