Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1432abfccb7ba6d…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 01:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b8409e27366f59fa0c763d04c8c8612 SHA-1: 556d09a4b0c2ed9d26eeca615f7f0816443e43b7 SHA-256: a1432abfccb7ba6d649a2f1d0f666dc63018ddebbb56e31d85f5249bb5f3d24f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ketchas.ru/uplcv?utm_term=run+3+cool+maths+games PDF link annotation
    • http://scuderia512.com/js/upload/files/9994951804.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/41375003176.pdfIn PDF document text
    • https://protrialse.eu/files/files/rapuwevelefobanepifug.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/26239101328.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/xixidadaxen.pdfIn PDF document text
    • http://horvathortho.hu/tmp/28163512578.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/80616729651.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/9440290534.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091413471174.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/241vo1jvp60gnd15gb4bvvant3/foxapir.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134addf37613---60364192571.pdfIn PDF document text
    • https://brukspec.pl/upload/file/tasiroguvowapajuf.pdfIn PDF document text
    • http://mebco.ru/images/file/nejilepipuweto.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/29037068694.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/79817434350.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/xarudew.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/80885290077.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/dexorori.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/vonut.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/lagobijipitasewekar.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/75068978288.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_off0000c691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC691 10804 bytes
SHA-256: f7f2e82cc34a864313ef0078877c7db8319ccf6f42b6e8fb9f9f829c00902be6
font_01_sfnt_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 17440 bytes
SHA-256: 5f5d5ea5e847683b19328670849ed3c6d459ee6265d671c6432627403848e44e
font_02_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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