Malicious PDF — malware analysis report

Static analysis result for SHA-256 43057661d0cf54b7…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 06:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c13386646ded56110912f523423ed04 SHA-1: 6f402f10fdabcdf91e4fe9f2bac5f77bb1dc0171 SHA-256: 43057661d0cf54b7d78a015d72268836244a069b92f89d61db08d6fe4b0979d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and external links suggest an attempt to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=powerdirector+bundle+full+unlocked+apk PDF link annotation
    • http://brukikostka.pl/uploads/page/file/73826811450.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/96596249252.pdfIn PDF document text
    • https://questyme.com/userfiles/file/81678974192.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tufem.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/68955337656.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/99413968863.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/76277196482.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/revatoxaveza.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/93271557623.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/43697576818.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/10070735500.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614011c0b0126---lenujilas.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/97412691578.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/91174198854.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/87902193775.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/kurusenuzoj.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/xusexusegafozujakukog.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/kuputomasiwaximulomupofir.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/xobilubiz.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/xotigimebedigolaviruw.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/duxoxodawuwo.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/49369626697.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/1874308178.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/fiwikurixozinelivaposabe.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_off0000c062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC062 10864 bytes
SHA-256: 844cdc1354ff41cac932e0113d7283b6b9a559f459fde8991604d1dd5670ae2b
font_01_sfnt_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 18400 bytes
SHA-256: 148deb399afdf571ea2b70331bbde918c1c1ead86558847ff617f0dbe7d2765b

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