Malicious PDF — malware analysis report

Static analysis result for SHA-256 2715685890255f6a…

MALICIOUS

PDF

76.3 KB Created: 2021-10-07 03:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 779f5094bddd6532df90c5b7430869d1 SHA-1: 0a6bdfa5c3d9ba7df1070d3e61dbd813d217efd8 SHA-256: 2715685890255f6a23e4c7643babead0b3b767fbdb3f137e4e9cc96e02e35624
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/88064580922.pdf In PDF document text
    • http://tchid.net/userfiles/file/65026862418.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/guvemaxirovitumiwogudilix.pdfIn PDF document text
    • https://adikketiga.com/contents/files/41937058127.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/zimolebododigamovenon.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/51708745919.pdfIn PDF document text
    • https://interconformity.ro/images/file/natifakikatip.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/nidakagixizinox.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/pubidisi.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/vazulupogikapatadavez.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/tiduzi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/flghi7ihk12ciptqfktuutvndu/sofopowenuxujabibos.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/tuwujasemisu.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/ralujomanatifi.pdfIn PDF document text
    • https://olterus.info/contents/files/kalojiveterivobanegisiza.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/begoxetovabapone.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/14355559586.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/susimorafamor.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/nabixelugogedutedizorop.pdfIn PDF document text
    • https://mimpishio.com/contents/files/rumixa.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef12fe55bb---19218064053.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/24/file/31722387621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=goiter+on+one+sidePDF 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_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 17488 bytes
SHA-256: d5a7f5db36058371329270cc7882748e6526653582c2d1cefa90ad032bf66345
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 10072 bytes
SHA-256: e5c9c9d7f3b0c0dfd15aac1666ccead3e44e4ef8a04914b1d97042f124a35f57

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