Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d068480b3485ddb…

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 06:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5dc1851afebd77bb112f2efa1ed916a SHA-1: 04d79e7dc99295cab3693758f27cf6727019d93f SHA-256: 6d068480b3485ddb6e363c40a1d4aa7d77d743e253f6bfaada195f1608e2badd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable or unknown hosting, suggesting a link farm or redirection scheme to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://icloudcleaners.com/uploads/account/autoresponderfiles/duxesewesadinesitajane.pdf In PDF document text
    • http://probeg2000.ru/files/userfiles/files/rufezalavukisawirupad.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/bafolagadorurerogasup.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/sobopuwumizi.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/56456992856.pdfIn PDF document text
    • https://menu2uplus.com/images/file/97354136748.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/pojunazefa.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/wagusaxumimunolovi.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/42833338249.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/vowupufejesopadim.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/42286548189.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/tupaderux.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f620329d15---94282869156.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/7734492519.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/17209163883.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/83636071712.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/35728799772.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/11105895225.pdfIn PDF document text
    • http://health-bridge.in/upload/file/palujidotijasitolowir.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/66711352911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=regarder+tele+sur+tablette+androidPDF 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_off0000b22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22E 10708 bytes
SHA-256: ef1ae1c35a12290bf88edda82b3b1060470936dc20ec9ac34df1d4c64b6ab076
font_01_sfnt_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 19052 bytes
SHA-256: 7de0427c416b87af8cf635c62795040bfebc714fe513030f04e773ac9d1f9bf8

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