Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a13c233a654b205…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 05:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfb9cb7325bd621ebb257fbf531ce69b SHA-1: 496d9fee484d79ee2ca864c257b2174da8a9e95e SHA-256: 9a13c233a654b2051dbd544c2a5bb3b5450de7386d9fee63c34748d7cbf422df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, many hosted on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to download further payloads or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=asterix+and+the+chariot+race+pdf+free+download PDF link annotation
    • http://naturallabs.de/userfiles/file/godabodimebamogopojumux.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/85011186098.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/24799218469.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/wugasojeluvekiwesem.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/vatizivasereluvipere.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/ninanuwojazezevog.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161369f466a6a0---57186132078.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/69909551721.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/videbiligemib.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/82075073096.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/bekezodajobenilibubuxi.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/57698782221.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/89557792912.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/ratasujabo.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/39817471320.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/kuduz.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210903223453.pdfIn PDF document text
    • http://geraldinekilkelly.ie/90208304995.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/mijusabepixatidutoxagodi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613283fb6d424---fivuwavoguvedazejaxusikef.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/65688083443.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/9815244886.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/83035038887.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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 19332 bytes
SHA-256: ead515e58e3112f96b1c097ae8b47529acb02cb0fa10789d64e6cb3c9ccea039
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 10884 bytes
SHA-256: dcd1ea20313938f341769e7358ef0f89370bb0f32b4532b99e46d1b379860146
font_02_sfnt_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1