Malicious PDF — malware analysis report

Static analysis result for SHA-256 a237da69c46bbfda…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 15:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f744c9e468a5d50146b8cc281370ade9 SHA-1: 1fd30967b7c96e5101f8ab77cd3f6045bd7e03af SHA-256: a237da69c46bbfdaf15b13c141e6cd29aa94445c13ec605a79b95122af5d5946
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is described as a link farm. The presence of embedded URLs suggests an attempt to redirect users to potentially harmful content or phishing sites, aligning with the 'Spearphishing Attachment' technique. No scripts were extracted, but the overall structure and URL distribution point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://metamorfoza-krosno.pl/userfiles/file/96047346917.pdf In PDF document text
    • http://timecraftz.com/userfiles/file/kukodofufubatumikavamanis.pdfIn PDF document text
    • https://filetorme.com/upload/files/migazufo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/38533475915.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/zewulegodor.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/51327896129.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/27104263570.pdfIn PDF document text
    • https://viceda.com/userfiles/file/kixesuza.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/nudinefijulubigiw.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136847544f5d---pozogufodevesumubudes.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/voporali.pdfIn PDF document text
    • http://aurora-c.jp/files/files/21374161984.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/bolaguz.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/80553629229.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/fobowuzigagamiwepaxavogit.pdfIn PDF document text
    • http://splogservice.ru/content/files/87302999735.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/makij.pdfIn PDF document text
    • https://gdaniec.com/upload/files/gesav.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/46345240376.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/rufav.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210920_5295AFEEC2B1A84D.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/monax.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/bunawitelabupexatotulala.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/53814589787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+apps+design+patternPDF 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_off0000ad01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD01 10504 bytes
SHA-256: 9d1486c051832b0d1d42dac29470ad0388d4216a6c3d5e4d8ce4475c5e0fcfed
font_01_sfnt_off0000c4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C9 15032 bytes
SHA-256: 8e51d0fd63eb42a3d1d923800c692c50aaa31f455d7d0f6eb4d684e73c9ada78
font_02_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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