Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f53c6013ee5d45…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 03:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9508cd6e2d24aa5b7ed0b63753d5df0f SHA-1: 276169e1dbd74af3abe5cc42e71318202695fa4a SHA-256: a2f53c6013ee5d45eb941b3425210120a13081209254a93e67bfdd987bc287c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains a large number of embedded URLs, many of which point to suspicious domains or files, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to host numerous links, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://archism.ru/uplcv?utm_term=top+10+mobile+brands+in+world+2019 PDF link annotation
    • https://solener.info/ckfinder/userfiles/files/wokeb.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/tetazibejalupawuko.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/6931757097.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/pibikabemez.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/41625537404.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/74001631186.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1632034588.pdfIn PDF document text
    • http://recviem.ru/img/upload/72529374208.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/nixawidokujuwanusipo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baec5a5421---77705964350.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/53816518821.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/wupoz.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/gitejetunukabu.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/91794418695.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/59438868308.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/45213549001.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/47753929327.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/71513425737.pdfIn PDF document text
    • https://red-adlay.com/upload/files/mobadugugunijedoliregud.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/wolopotuwefosobone.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/21404638457.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/fezol.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210910110241.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/wasaxijijawufunudak.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://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_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 17608 bytes
SHA-256: 69452531fcd4086f8ecbf7d8b09e10ed8edf3acd280f6a1840ceafaa79f35ea0
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 11108 bytes
SHA-256: 948874bb6ea805fc27eed405a0ec4f30cf294632f0fab2e86839307c8cb1c9ca
font_02_sfnt_off0001252c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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