Malicious PDF — malware analysis report

Static analysis result for SHA-256 842cc98c18d01f6d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 06:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 771de5b335e8a1a3feb8e5c46ba4c399 SHA-1: 809cff9d87cfe758e1fcbdc060f69e8a53b341e6 SHA-256: 842cc98c18d01f6d3f1b6145df53a2b650e4b2b5c22bbec9cf3b57a282306cee
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://costabravas.com/uploads/localidades/files/31838449012.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161397a69f39b4---62347841819.pdfIn PDF document text
    • http://www.depomatrial.com/file/51744099783.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/xivumewut.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/9009809924.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/51587721455.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/62164059197.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/2026469185.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/kakidivibafugu.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_232507.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/12/file/20210912_162625_158.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/nanakegapijuz.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/36201173143.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/zusotelazozon.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/11883966980.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/79199692472.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/85500574363.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210901075355.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/86137347639.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/gufafexaralibodigeru.pdfIn PDF document text
    • http://xyoaa.org/sites/default/files/files/73703213002.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/xeserezupedujigewijin.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/44969085163.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613335af29244---75475740863.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/nijonivesonuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+download+video+from+android+phonePDF 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_off0000bb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0A 10740 bytes
SHA-256: 81218d22e80640085e33742924a2fb3df2943cd201437e9bfab4694929344ad5
font_01_sfnt_off0000d372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD372 15256 bytes
SHA-256: 83a68bd19e027aaffb17d1a8d454fb355099696e0d69a9d66805f538b56f9107
font_02_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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