Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62b2ddf8e3868a9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-25 20:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fbc29e0c8d324037a1a82e1e685ccc0 SHA-1: 71808386a61c181cc85b75e1b91187c6280be1bc SHA-256: a62b2ddf8e3868a9fefd73a02f8da55acbf9bf9721a6ab944904e36c39e3d95a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of extracted URLs suggest a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=eliminare+aggiornamento+automatico+app+android PDF link annotation
    • http://fsnmmaterials.com/UPFILE/userfiles/files/nufixuwodafelemugoxezawe.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/xoruxa.pdfIn PDF document text
    • http://origo.ws/userfiles/file/xapamumosufaponuja.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/80229615993.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/25365431057.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/78636731211.pdfIn PDF document text
    • http://bankerz.in/qpic/files/76646832455.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/vebezone.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf0110cdbc---rexewativupoxamawuririga.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/49278529117.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/19958217014.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/99899859599.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/72136228157.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/daselegetemaxixivotab.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/57735215277.pdfIn PDF document text
    • https://tempegaring.com/contents/files/42335084314.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/67317054174.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/dijebefutajaf.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73fb901cf---68191206201.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/50833664269.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210914091706.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/maxidamifonolalazuguzubox.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/81670209507.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_off0000b7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F2 10772 bytes
SHA-256: c8da3e2aa63c5b9fdcb1a08ccd4a7bf766187b8b388702e4be2befaf84cc17d4
font_01_sfnt_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 17484 bytes
SHA-256: 75da0998d690c73383e978b6711f0e827a0a4395c2da4d1230a0e1647d3f04dd
font_02_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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