Malicious PDF — malware analysis report

Static analysis result for SHA-256 7437f2a39e3769dc…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 01:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32c42f405297005385be07821bfe7d09 SHA-1: 02fd4c472e36a1464baf18d4efa203fdabf656f9 SHA-256: 7437f2a39e3769dcc8d280c0df6183c292cb4ab1646b910683160704e94bd02a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bnbcostaverde.it/userfiles/file/89999212671.pdf In PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/67009898144.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/larorajagudofow.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131120f6d348---lufugagifonobem.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/11310133410.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/petogul.pdfIn PDF document text
    • http://planbmedia.hu/files/81278201434.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/61683973253.pdfIn PDF document text
    • http://paron-rebondir.com/uploads/files/gamewowizodipagaz.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/rekutekokugefoximub.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/29413869877.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/90385127569.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/puwalapuwexege.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/fikokadigagef.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/77625984174.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/8677150916.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/74866310544.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/50495512536.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/kisuzisaxatoxerosotux.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/80914754988.pdfIn PDF document text
    • https://designclarf.it/file/51976517439.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/wuvos.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/81996148589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=suicide+squad+movie+downloadPDF 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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 18440 bytes
SHA-256: 7597ad5c80435306d007d11ae93fc58333cb7d668edf383d584e290110108557
font_01_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 10804 bytes
SHA-256: 262eef5f6e88d478379252c33ae08fc7cb22590cbb0bc1e4bb3a74c47f09bc53
font_02_sfnt_off000128a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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