Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16a5e244f976c50…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 17:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1df098e1bbbff5c703bed9ee7c6d5447 SHA-1: 6c64a74df42ffecb8645e2d09ddb941c70691035 SHA-256: a16a5e244f976c5084ab69cec575e22dbae6335c866cac77374b617a119d4ed7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely serving as a lure to download further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ji-tien.com/userfiles/file/72835585570.pdf In PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/12902721819.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/nitoper.pdfIn PDF document text
    • http://timocomputer.cz/files/file/kamatituwuwixesetoz.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/puzovopemufu.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/72087706217.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/61681409207.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/54087507545.pdfIn PDF document text
    • http://www.polni.si/Images/files/76173328471.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/13137459613.pdfIn PDF document text
    • http://bdnchem.com/upload/files/pufonofarejifafetopafawos.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/33962509579.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc4cbfe66---89601844059.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/fizekemafefabomitufimu.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/30766743261.pdfIn PDF document text
    • http://envigest.cz/upload/file/fomobotupixo.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/1719471482.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/verodinewodoxelekitaneni.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/34625433184.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/27315425921.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/loxukaramupe.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/54399474467.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/netadituxagexores.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/laromud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=game+space+download+apkPDF 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_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 17436 bytes
SHA-256: fa01731a5fb1e23fdefff41134c71418f31d7a246a3f03b04a5654e71449e1c6
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 10600 bytes
SHA-256: fbb20b4dd3f51472825fb1c059582210c341b36f241d4e8a0dd0ff6969e978b0

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