Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ae063e88abdf34…

MALICIOUS

PDF

92.0 KB Created: 2021-09-08 19:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 582a38a1895956fd38edfe56ae93d89e SHA-1: a0c9ea7016ee6a10b7ea243ec5adfc6270224487 SHA-256: 67ae063e88abdf3441377b601122d6ea70ecc491e711c64277d48f1ff5584173
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of phishing or malware distribution schemes. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the PDF acts as a link farm to obscure the true destination. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 https://infrive.ru/uplcv?utm_term=hydroelectric+power+station+report+pdf PDF link annotation
    • http://theurbanbazzaar.com/userfiles/file/87094949649.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/64042821953.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/8837474420.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/71372594797.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gagofifuju.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6526c849caad4a9afe6bfb83b7f8d996/82608950517.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/kukatabigazozo.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/6132237028.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/71800885059.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/xupizalojaguwid.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/56403139624.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/sapuxamagogipojipogekowad.pdfIn PDF document text
    • http://ap-qatar.com/userfiles/files/mumapugar.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/xejinoradodukada.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/silijozilazame.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/93451678411.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161368cf16833b---55628499785.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/61846385734.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/17927866671.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/lujabudinotamizediparar.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/mokapufifefokigora.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040302212278.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109051319311840.pdfIn PDF document text
    • https://coevent.ru/upload/files/bovosivugenageluwutakipi.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/pitamekugaxemevof.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/fosunonogolatulitopop.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/27226319863.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_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 17228 bytes
SHA-256: aedbb94f95982cdb7acc2a1f5b7570024828e954f51d9688a0a6b718de4753bc
font_01_sfnt_off000130ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14905 10804 bytes
SHA-256: d34f5aeab630454a0ea9e5e34beb57bdc2d90bec680f0bd35f4722c792549839