Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b570c67074197b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 15:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 473f9aef098496f3c64a0f4f14130827 SHA-1: 24288f610a7a66731621e9c3f93bf0337e9dd09f SHA-256: f6b570c67074197b59d124244b63954f17fffe70b9f8904c043df806a6a0e5d6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or SEO manipulation scheme. It contains numerous links to other PDF files hosted on various domains, forming a link farm. The embedded URLs and the PDF structure suggest an attempt to direct users to a network of potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://principesgs.com/userfiles/file/retezef.pdf In PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/semarukod.pdfIn PDF document text
    • http://asid.rw/userfiles/file/xuzijaf.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141b35a61d2a---fowurazijilenopo.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/bexor.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/78587731525.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/wabiwodufazalakeretufepaf.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/39psltqm2urlnv1geamactfjrh/30339175412.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/89103962122.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/88050849705.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/82893161821.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/42637156851.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/80442077772.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/vonisefev.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/8908950088.pdfIn PDF document text
    • http://geasit.it/userfiles/files/lefogivenano.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/pazupativoj.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/kirapedutosezeguko.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/39740078083.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/46616193966.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/67010896550.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/puxavemetedix.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/18084054151.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/todonogipufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cillian+murphy+a+quiet+place+2+interviewPDF 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_off0000b20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20F 15620 bytes
SHA-256: 1571db706558f6bf21103af492f0062e1e4c1ed64180944c1b3d1b4a90edb9a9
font_01_sfnt_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 11016 bytes
SHA-256: 5a157afe42d8152b00a75ecfb8891572fbe237b5477d75e99b98e126b56f6e27
font_02_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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