Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5ffd6b5eb1d0ad…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 11:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c83d470a3ac257f44edb0528860bc325 SHA-1: cec9fa3f1e8bb5d97934a9fcf7212fa7bc6be914 SHA-256: fc5ffd6b5eb1d0adfecc504363fd88514cf4e09eadbd3f87379ade0187d41e3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, identified as a link farm by heuristics. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the link farm behavior strongly suggest an intent to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=metro+2033+novel+pdf PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa46fc9fbf---rewapuk.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/36724594487.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/titinozubibexoxifejuvaso.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/lejokimotabop.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/rofolemajofigumojovo.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/lavuxim.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/64893304091.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/8541526492.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/45503301228.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/90600844950.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/40181325591.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210914020508.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/jixijase.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/20813115963.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/mudobixalowajoradu.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/merojofanegubuvugamobafu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b0f26758fbefb163ad76ab735db6c50b/81732691973.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/jibuxazunutabegixetuvig.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/37961075797.pdfIn PDF document text
    • https://preciseenergygroup.com/media/47565935799.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/nifemo.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/64467259887.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/kawexiguwijanubowazof.pdfIn PDF document text
    • https://novsport.com/content/File/zakejigis.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_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 20012 bytes
SHA-256: 04d7ced6bcf15f01ba3608f4f59d2890445810e02b056efe281bc1ac99fab6af
font_01_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA6 10544 bytes
SHA-256: 3ec1109addd44af6ff314c008ff9932ea2c1e32709bf747e45c570ab9212d9d5