Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2942a2fb49e761e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 20:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 475ca7d921746298bbce62e571733c8c SHA-1: f3a9aaa2195394f1703ab6a2fe86ff3f3e44bcf3 SHA-256: c2942a2fb49e761ecfd3ed5f5794c9fecc79888de8339f8695c4d0edac3e8e92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=online+multiplayer+games+under+100mb PDF link annotation
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/40645454338.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/zewejavimedenusivak.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/79021890684.pdfIn PDF document text
    • http://a899.net/userfiles/file/72410223543.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ferifubaxedofo.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/19425258752.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/zozakoguzufasubulaje.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/xosazosividedo.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/96238572697.pdfIn PDF document text
    • https://anaksemut.com/contents/files/kosava.pdfIn PDF document text
    • http://mosjob.ru/images/file/rubixemufo.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/dozogafenabilaku.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/54202173691.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/tirabuboxenamepuvivuf.pdfIn PDF document text
    • http://pnalog.ru/images/file/20030839470.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/kukatatolavonag.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614025569f2bb---81938910818.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/vimufonidisabopujolar.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/fokukaris.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/fufodivorob.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/rogafu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/63ab27f8c2b1b0822b62104c10e4c91e/toseditinas.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_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 17456 bytes
SHA-256: c43bbeb7b0cf94cea83c5985d6e5db15f417b52ad772d1f0508ac38161bfb51e
font_01_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 11168 bytes
SHA-256: 64eb3d7d7762c134adc960f44adb015cbda61985c049174addc2bc69afcfabf6

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