Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8f4cd38c41880d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 00:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: add39f7b1595366fa1323b32a02d6e79 SHA-1: 87e0c8358219ea47d05263742040a1e78656fd1f SHA-256: 0c8f4cd38c41880db9283ddfec214fd6c5d2d619e996284bda3b87df659d9b32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=name+any+five+application+software PDF link annotation
    • https://testagenda1.myagenda.cz/pictures/editor/files/35858974123.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/71914657245.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/fafajegivuvugajoxizumo.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/nupapilokavesa.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/tuvijuteto.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/jafolotubidivinefunano.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba03d099b9---rerun.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/168112725661358a6509c82.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905100833066.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/67856272234.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/96856669869.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/dabusamirigeriwitife.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/bebexepajovomodizum.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/61846385734.pdfIn PDF document text
    • https://egf.tw/test2/images/file/matarikikip.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/linevev.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/95846079610.pdfIn PDF document text
    • https://hotelcorona.ro/files/tanazosoxibagosedubotopu.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/dexiwujefinolavowufogix.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecead0acae---12371595009.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/mowarunoku.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/vezadibatina.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/57353849311.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/73668608338.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/29289880055.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_off0000d7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 10884 bytes
SHA-256: c3bd04de887de945dc9468952a3ea8b03df89432a3a8c43c4a83ca7ecf5623e4
font_01_sfnt_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 16936 bytes
SHA-256: 0e81792ef482863819f3ab3889009c92cc61d10bfcd3907b91a701d79d6696c9