Malicious PDF — malware analysis report

Static analysis result for SHA-256 563d35f2fce80fb1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 18:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62bc69478a00e5e360a849e98a44696a SHA-1: d48e1edd273b4f081a0df75fdbf74571a4240064 SHA-256: 563d35f2fce80fb1682f027328f7ac244b36b82437ab587383fd32fcab5a3638
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggesting a phishing or link farm strategy. The PDF structure itself is also flagged for containing a link farm, further supporting the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=iq+papers+in+sinhala+pdf PDF link annotation
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b23f1c1475c6eddfcb3790b976721d98/36722358276.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/juragiwodegalimu.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/83965177130.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/19054133770.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/witavovitu.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/29242352403.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/xigoditabasekonufoluge.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gujazapopodav.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/11732736230.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/minenopugeratagefi.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1618935275613cec91d9e1a.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/79626501743.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22086734260.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/37329174680.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/46672474413.pdfIn PDF document text
    • https://dhesient.com/media/54413897746.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/20883349823.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/dc566e6064d7b75f0ded30e2617b57e7/nadijojujinakawo.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/17866614555.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/25771812159.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/silazatesigij.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/14114643407.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/zafemonisetanafel.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_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 10472 bytes
SHA-256: 8395404e1401b84bbf249b5a196e10705cb2702bd900041c50250a4007959cdf
font_02_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 20412 bytes
SHA-256: 334c76a2d567da880ca49ea0437d49a2319604be165a888fb4966e798451f6ca

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