Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d47479cf1e8093e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 15:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c69a873984759fd29cdbb77c3d0aefbb SHA-1: 472be75cbf39b1e70e9d4cb7139f0dd29e09cfc0 SHA-256: 4d47479cf1e8093e27ed368dbe66fbaa52d47db8663e7c805a1d7b97e5041b86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or scam attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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=the+bride+of+the+water+god+ep+1+eng+sub PDF link annotation
    • https://satuldelut.ro/ckfinder/userfiles/files/wazowutitelodotofexiwitaj.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/22272058884.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/geduposawopupat.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/34882975024.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/98292105721.pdfIn PDF document text
    • http://espwireless.net/uploads/file/45565473989.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/52180362462.pdfIn PDF document text
    • http://pactolous.hu/upload/file/82406429262.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132776e6a714---vosesadod.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/xijesogofuvukarejefamuso.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/6540628406.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/sazapuwusagavekusujepuno.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/bulenodamu.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/zananunapav.pdfIn PDF document text
    • http://asid.rw/userfiles/file/25109977919.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/kuloworozuxakizedono.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-16/images/files/28887059577.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/ziguxezatizerid.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613485b22d09a---sorowokotujujesix.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/56146900019.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/62072344030.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/ketobelojuxufuxenemexe.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210910005902_497350340.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/mewop.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/30740236948.pdfIn PDF document text
    • http://rsst77.ru/upload/files/80304466174.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_off0000c482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC482 19636 bytes
SHA-256: d84324a26a4961d2320393cbdb84916941e71ef054f7d083b815bdfc9effa16d
font_01_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 11072 bytes
SHA-256: 30c96c7898d53af6d3ab4a1e63ea0406f0304d392aa9c7d9dff2a7a180cbd432
font_02_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1