Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea6c4632fec9b6e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-19 00:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e826af194eda2c7f3b03e8afeff967dc SHA-1: e015245b7a7fcb4323b3e3040587fddf5d61dd44 SHA-256: 5ea6c4632fec9b6eaef57f302f20a1b13f52fe5991de2291e90253f38b1a0021
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using a large number of distinct hosts. While no scripts were explicitly extracted, the presence of numerous external URIs and the ML classification suggest malicious intent, likely to redirect users to phishing or malware-hosting sites. The file's structure and the heuristic firings point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://caycanh.vn/images/fck/file/55990665525.pdf In PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/wujat.pdfIn PDF document text
    • http://chemicalengineers.ie/images/97351650352.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/tiroxobopijomivuguzu.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/30439216998.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/fakuraf.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/1930789573.pdfIn PDF document text
    • https://tcremich.lu/files/files/duxixugaludavisidowa.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/25187804785.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dupaxuwifazovakilodil.pdfIn PDF document text
    • https://mimpidia.com/contents/files/26776210657.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210906105114.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/86749784611.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109011126261549.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/rudiwu.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/wizuvigodofelu.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109141042435902.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/xuxusetuvusimugi.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///loromogijaxulisiziwi.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/84720356551.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/navudunefe.pdfIn PDF document text
    • https://songhong.info/userfiles/file/31959768703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=clash+of+clans+full+modPDF 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_off0000af61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF61 10452 bytes
SHA-256: 1e6cc5afabf35142d69b9a682a843fb8f5d619a00486d6f22f832a50c5c47d3b
font_01_sfnt_off0000c6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E3 14344 bytes
SHA-256: 9ba073ff0aaf116b2319aba4af30b59730800b4189e0c414e7e699903a5e632b
font_02_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.