Malicious PDF — malware analysis report

Static analysis result for SHA-256 86850d780834085c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 13:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aadefd49f60d5514ac3e9c337c0ce22a SHA-1: 44c3e138ca4e610f84e4305dc2b65585243dfe2f SHA-256: 86850d780834085c7f407670af0dd48cb3cdd786c3d3556903d614670970551f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the PDF as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of many external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=jewel+games+download PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443338146cc---62605156413.pdfIn PDF document text
    • https://comfort8889.com/upload/files/56222312106.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/36755827117.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/puxizewerepijidogitekilo.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/43522884704.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/64350569929.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/bisujujuz.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/dubixujotiwekisap.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/topulukenelevebevepafo.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/sedularakolemetu.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/lasejivovoxonemokuz.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/43385478536.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/wepolagajoruxomo.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/48151146020.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/91053719761.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109040713151073.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/minitovodugisenid.pdfIn PDF document text
    • http://canadianrockies.info/files/file/repexelovan.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/64693569895.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/48073496689.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/tadobazizubebepewimonivep.pdfIn PDF document text
    • http://ipceurope.com/assets/file/fubanonufarip.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_off0000ba0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 10376 bytes
SHA-256: bfd67b4d8cdffbdca235b11e0ef143265fffd6b87e8e1b2302d10b7cde2550cf
font_02_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 16544 bytes
SHA-256: d6280b7a6c10b867e43aa0df2c47650716166fd4daf0d92453e4281181a63e7d

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