Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd049ec105651b13…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 23:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9514f9e46c2d2a64661f60c665e7df1 SHA-1: a55e80b386d59d55afd9df3921e6c89cb3011132 SHA-256: cd049ec105651b13382f56cb1f2175c6acf2b3e42738fbe9a254b0368bf4c9eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior, pointing towards a phishing or malware distribution scheme.

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://fairtradeportal.pl/userfiles/file/gijadosukojujo.pdf In PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/22569365175.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/kirakazunewekisi.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/98140413351.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/65113207725.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090901514786817.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9fccda62---61227042678.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/sutupi.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/66084884008.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/luvugajuwobiwabobojuvimi.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/gudijawunuvizulenoxiru.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/79769993658.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/fivapabaruwobavuki.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f097d191db---55561545587.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/46599944447.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/mukuzugowudulafutazixu.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/xabiwupexisikibapajefaza.pdfIn PDF document text
    • http://skncn.com/u/files/wovabamanakoxotujerul.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/gefezunibukatujemebope.pdfIn PDF document text
    • http://artio.pl/files/files/48399271225.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/4594513899.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/rexebeluwabomoxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+walking+dead+season+10+episode+18+online+freePDF 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_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 18032 bytes
SHA-256: 31804d32d91239557857072842ec8a4b8d8fa49ffba0cfeac60edf20b37b5506
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 11200 bytes
SHA-256: 81dbd75ef05f40db6f7b669bf69fd102acc3eb07bf3b656bf9bc6cfa650825ab

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