Malicious PDF — malware analysis report

Static analysis result for SHA-256 828ec1b147197cd8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 15:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 11ad5a9f993e8bef3f219568743a8ab6 SHA-1: c5705ac81593a674df46e6f56938fc03bab59460 SHA-256: 828ec1b147197cd88458319a6a038ca8d19422d5d5ebaec6bbc0da5edfd71818
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=how+to+change+user+agent+on+android PDF link annotation
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c8c809513---38679901983.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/mukir.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/kitusugoresojevemefonewap.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/vofif.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/25205251498.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/dffc678f8a9ee9a2b9ba082cca8f1061/30657965488.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/gapilokutuposoxidowexeg.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/vanuxegezax.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/16973225572.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/pawonuwuti.pdfIn PDF document text
    • http://korytnica.net/data/files/gadujezijek.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/gijenep.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/lagewogedoke.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/64576829276.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/tapoxasumarexiji.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/49958524660.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/xidaxuguzurunikajo.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/6673465647.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/sedujikulugowovidaji.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/11638597116.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/jotosexo.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/73069899785.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/82502559597.pdfIn PDF document text
    • http://specimport.by/files/files/babanekamopowuto.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/kulijinulaxefaruper.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/jedorilupuperikawowag.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_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 18504 bytes
SHA-256: 99fbf314af58beb7986329a1e334f9291d88808ff8d093aa1328aea59cc7ffad
font_01_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 10780 bytes
SHA-256: 606d4ed89679211a67a6ee96e134a74a690e25166dd4817a7d72c75e2adc58b4

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