Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9e4cac2f020331…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 07:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e31baf7c8bcfaffc320d3bcd3f48926 SHA-1: 7efb3e6795a82a9ab7a3ec497af6b1ff987559ac SHA-256: fc9e4cac2f020331cc6819eceba02d8f6ec6d542efc5d57d556783674945809d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users to download potentially harmful files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document is designed to trick users into downloading an encrypted archive, likely to evade security measures. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=zip+apk+for+pc PDF link annotation
    • http://bachtungcompany.com/upload/files/34064129423.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/nowumekagajenibaro.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/29334112904.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613051a398874---dabarerusa.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/rujuzelejebosogal.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/68495847067.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/phmn8s94150mug127u2et2ilcl/vifanuvizomes.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/zinimakulobapapasinekafa.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/79816447105.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///48961856748.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/vidofuxujavisudif.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/79497581317.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/wipetotokeke.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/28477996192.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/sujixupodefanepojesu.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/59996884073.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/19415399092.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/7975176794.pdfIn PDF document text
    • http://floramarble.com/uploads/fubutivisedufirejidiw.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/nawazavabepukeraze.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/kodibedokerenikogogo.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/52563249649.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/68921974475.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_off0000d1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C1 9980 bytes
SHA-256: 1007654e10da6f7dde0d8adcdd71ee10afe9f4f65deeea197faf2046e1c4240e
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 18728 bytes
SHA-256: 21be7fcd1a3ac6cb8509893c6241c8e78de0ac69e7a73fe00c3b2dd830cc49ab
font_02_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1