Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d25a62c796858b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 14:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93827dcc25bd5978841a2462d3bef66a SHA-1: cdb8e45942001caf61d6f3810cfe4f44e9102f28 SHA-256: c2d25a62c796858b60cc429212105e9130f044c85f75dd8c3421be39ab0b66f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. Numerous embedded URLs were extracted, many of which point to unknown or potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dakmet.pl/upload/20631373691.pdf In PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/88324384542.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/56613273341.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-12-21-57-07-44.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/40010020461.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210905180334.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/41175969153.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/galelewofepalokofipesiwi.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/gewumuzejatosukon.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/nudufopot.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/bixofupijurelaxapewudaraj.pdfIn PDF document text
    • http://jcpingie.be/public/files/86869433831.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/81205028562.pdfIn PDF document text
    • http://keitbg.com/images/files/26565066978.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/rururifuwex.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210920184443.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210918043652.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/58371517626.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/59590186659.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/74824241180.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314a8b1c0e3---gaxinibiziwutef.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/15568475389.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kukubagevigez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+survivalist+game+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_off0000b187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB187 10824 bytes
SHA-256: 08473109c4e5f67a3533ced048f3ddc558b8c85346a2b96b31dbf46bb55d92f2
font_01_sfnt_off0000ca22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 15740 bytes
SHA-256: 93ce672677e9eddfb05e2b3df5f935196a131597a831a7ae0ca14e15826f1468

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