Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6e7421b1316bdd…

MALICIOUS

PDF

68.2 KB Created: 2021-09-17 05:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 748d8edccc12af8407fb103787226258 SHA-1: 7bddf2498d64fef759d35080e3a302f6f8c83c05 SHA-256: 3c6e7421b1316bdda388bd25c8190ce61936f0f77c5bf06423ad463f3169d366
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for malicious content, likely to evade detection and facilitate the distribution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135b1075e4ff---datidadebomekefemes.pdf In PDF document text
    • http://dexgerm.com/data/file/userfiles/files/fepitomuzaza.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091411293873499.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/46072850845.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/49960703434.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/28518494593.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/85001981864.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/gemunipezinefed.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/gijov.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/37015366358.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/vuzudijutulopi.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/dimifekosotakilamu.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/wexoninalinilume.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/pujukolutiro.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/6429777049.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/37229140755.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/61515348612.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/24350915727.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/92758752341.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/xozur.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109102056412640.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/56226293056.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/xiginoni.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/88143720417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=telugu+bible+vyakyanam+pdfPDF link annotation
    • 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_off0000ae94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE94 14992 bytes
SHA-256: 74234bb883d44ff17f4ab0992468903f91a5db7cf12681f247a54b001e414968
font_01_sfnt_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 10832 bytes
SHA-256: c2327d20e865662e1c81b29b427cec284a975a84a66c86141c0209de202749c9
font_02_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1