Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a45569f3237dee9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 22:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53977f648b872e51b805d44e328706a4 SHA-1: 9d12f06f78c5b70448a95f4e274e15946867d4a0 SHA-256: 7a45569f3237dee9cc239cab369e389107dc6785c1ef6c86fe92b0616b25e4c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious content, suggesting an attempt to distribute malware or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://turatabor.hu/media/57535992552.pdf In PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/lomaxo.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/37094631181.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/75351107844.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/33658379096.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/putelamamika.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/depetazi.pdfIn PDF document text
    • https://datajournonepal.org/files/radutepamodisakitodekunix.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/39678052354.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/mabupajupumimedufegovan.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/napefabizugilasigasu.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/jagejir.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631361596.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/vitejituxapijojiro.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/64707953094.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b739a336bf---96175754220.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/26341482886.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/51918416232.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///23019976097.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/japipanokabade.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/5263751731.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b66923d09---xakewivusuboremagatamup.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/mimejiwukututikokip.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/25603690191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+modern+periodic+tablePDF 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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 10732 bytes
SHA-256: 1484d1b2eaf125b52d8fd3520bad1c05452d2a736246fe19325518a71f3f9256
font_02_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 17700 bytes
SHA-256: 5f875c789535e91db12547ceb82d1681dd9761d21bd936175a55cd46368dab89