Malicious PDF — malware analysis report

Static analysis result for SHA-256 187de6c0b4cd7720…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 23:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 917bd83d0d0486583939e8b73e4fe53b SHA-1: fb25f889eb41b041e95c3d2b45aa6fa06a4f8d46 SHA-256: 187de6c0b4cd7720fb402d6fbc9c4d652000a38d68e674d25b211d7e0f80b577
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=pes+17+apk+obb+offline PDF link annotation
    • http://mylodge-naoshima.com/images/blog/file/14484220536.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/14394311272.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/tusawedoxisutikis.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/7102928383.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/95103072426.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/74897205109.pdfIn PDF document text
    • http://355353.ru/userfiles/file/94858039353.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/kikodujilubidaguduvuw.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/80905152794.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/62129861654.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/muwazuwix.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/lakovisan.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/pitazofatekopavanutag.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/xasomekodimokedol.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/2392762499.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/85567234799.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210908_064958.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161349f5b43028---85253060434.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/75593801869.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864b7d2ca6---50428466151.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/79192596321.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/74216056455.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/73288540600.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/82237576505.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_off0000c63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 17268 bytes
SHA-256: 148e0c3e9dc2d2f4ce3ec2ea1716acfa73df37ccafdfdcc9daebc70ac8447c22
font_02_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 10488 bytes
SHA-256: 731394f8ad98955a02185a47cffb93c7d759ccd22ae1c85fdd787a619e8e7478

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