Malicious PDF — malware analysis report

Static analysis result for SHA-256 0335ae440fd7e838…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 22:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8e7fd61c72ecbddb02b1eec60e58005c SHA-1: 973f4fadb1fcc7b07f59ba7df3a12e8e026748d1 SHA-256: 0335ae440fd7e8384a5e45963cfb09ca0d959e5b3585b21f91decf8f09c9ff2e
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 0.9960

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://infrive.ru/uplcv?utm_term=plants+vs+zombies+cracked+full+version PDF link annotation
    • http://flyingkirin.com/uploadfiles/file/131947418950.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/gojesiguteberanulewejaj.pdfIn PDF document text
    • http://idroter.org/userfiles/files/33641818900.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/nigalu.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/ruwodi.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/14415208407.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/26161990451.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd6186074---zapefubakomesowukikejuk.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/juginemamo.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/60969264392.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/80279201854.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/85391268595.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/45703816298.pdfIn PDF document text
    • http://halmar.info/userfiles/file/talikidilagulukik.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/65402605596.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161361e0d767d3---mepuvakejovawozura.pdfIn PDF document text
    • http://etkenkalip.com/files/demetaludilalatavalogig.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/44485963138.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/72431628301.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/85995974516.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/86333997678.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://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_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 18936 bytes
SHA-256: 7bb7be1b057754281759364d7db2abcc4405c0660268db0de2ed085661edeb75
font_01_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 11096 bytes
SHA-256: fed90adef932cb17a1b62fad36e6e69570262e837f7dc540b6cdff285461fc57

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