Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3881e4b93ee8396…

MALICIOUS

PDF

68.3 KB Created: 2021-09-19 04:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9470246756bd3b385598007be21e3c9 SHA-1: 70b591ac57d0e9ba5a8219ce3353e03269bcdea1 SHA-256: b3881e4b93ee839694ee1fbcb18c526463f127b1859e3445853457bb1c4f2c4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, further supporting a malicious intent to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=chimera+ant+queen PDF link annotation
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/42884399111.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/50236809501.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///sigilujul.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f53486f33---posinufuzabakabuxa.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/16092333355.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/8058073599.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/37477729503.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/82384949815.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/sasaleditanir.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/11910871437.pdfIn PDF document text
    • https://robertbah.si/files/file/delafetoxivipabozigiroza.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/kaxonetegugexejeme.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/vebebutetajopubogiko.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/kijikudeg.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/wejawajefekekewezu.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_off0000a867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC079 18264 bytes
SHA-256: 8cd1bed5f851fb78566c5d7a5aa696995fbb3ef7bbc90c5be4bcddd8c3d6cd57
font_02_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 10316 bytes
SHA-256: 248e71302c1d193564a6148c6b1785258bcf8f1121819b337d746f9194bcd097

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