Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d82f0e76f0120b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 23:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 421a580c170e75b0b4a88eb57634aae4 SHA-1: 9b68623e6d014c5e969ef709d55fc52f3badc8b2 SHA-256: 04d82f0e76f0120b937c2bfd59948bd0fee4c8b362af41739f4dd718b5acdd78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution attack pattern, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://vipbeachhouse.com/uploads/editor/file/xunetutabar.pdf In PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/napekivike.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/40237254937.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/winidovunisikujomimoxef.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/futibis.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/78802997599.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/xonolod.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/44192680779.pdfIn PDF document text
    • http://belst.by/upload/file/27855866904.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/migabuwebujofured.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109102231257431.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/79048868154.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/65531642662.pdfIn PDF document text
    • http://builderall.info/userfiles/file/ruvavalumaborixinapok.pdfIn PDF document text
    • https://ijpdua.com/contents/files/wegoluvefuladexirazux.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/zotebax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349d9f85d33---mipilemepaxiwamebu.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/nadulaliso.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/jirapam.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/rasidoruwikoxerovi.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/70735624190.pdfIn PDF document text
    • http://xsteelstock.com/d/files/buduno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=factory+default+android+phonePDF 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_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 10740 bytes
SHA-256: e6ba7f611df0169178be05c4567a3295377e61ebad9f16a9e40d65629e65a3b3
font_02_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 17620 bytes
SHA-256: a51d11123a0c6faa5512242c17a153cdb0f9a91725741730437a1e8bd52f4d0a

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