Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9f10e2bac57861…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 13:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b8f126d282c1ab4c42be03d3754637b SHA-1: 0b5323bff14fa6c2c1ba10c273920fbcf1cee0a3 SHA-256: 0b9f10e2bac57861a2814c4289971fcf0102b6435e018728c9840c3d48f84b34
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and numerous external URIs pointing to a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The PDF structure and numerous disposable domains suggest a campaign to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=old+friv+fireboy+and+watergirl PDF link annotation
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/povexobetegabiw.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/sevanepefobe.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xeloke.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/pomatoviwibagot.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/3657780118.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/60983482922.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/23943369845.pdfIn PDF document text
    • https://mmtours.si/uploads/reromurowebowogafasowolo.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/96540808797.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/xevoso.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613569f921265---jadil.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/1747734168.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/3c08212e29ea260156295150362bf154/zifaxeletimikage.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/vadomepif.pdfIn PDF document text
    • https://hoavily.com/uploads/files/82964025671.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/rudinajatumido.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/56242270531.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/21854800304.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/jejuruvadasab.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/79816777929.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090401245813.pdfIn PDF document text
    • http://chamdure.com/DATA/files/jexuruzarakuviwo.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905151352211213w0vgk7.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_off0000c7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C9 10792 bytes
SHA-256: fb38bcf29e31677e16768f412363693dafc16f2876789b00ce0eed25fab81b7a
font_01_sfnt_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 16852 bytes
SHA-256: 51b7cd225761e0373090a71307fb8c55d71e317b0ca45261b0e266770dce18bd
font_02_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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