Malicious PDF — malware analysis report

Static analysis result for SHA-256 0638e6af183e0eca…

MALICIOUS

PDF

76.3 KB Created: 2021-10-10 14:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 35432612773821112b75cf70d1e8728a SHA-1: fb7a0d3fc8b8a0d94863820f023eb2caf7ca6283 SHA-256: 0638e6af183e0ecabd9ae68e91f035424db5bed94be98a45b4ed20fb8a8d93fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a deliberate attempt to obscure the true destination. The presence of external URIs and the link farm behavior strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=examples+of+allopathic+medicine PDF link annotation
    • https://mobile-translator.eu/app/webroot/media/files/naxonugogofumoxerisifuner.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/xepiruwifisasanajoto.pdfIn PDF document text
    • https://devisme.maxtis.com/userfiles/file/dekokedubutasiwinokene.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/97708677816.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/tonebasat.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/42642148445.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/jolikovaponexomabe.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/rekem.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/wuxujas.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e360b6b2b---45147300538.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/90752213857.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/60621328310.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/2012032026.pdfIn PDF document text
    • http://kahasat.cz/data/file/zojuji.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/92929568824.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/18797172029.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/69180794974.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/nukumuto.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/koratakapojuguvej.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/42156258047.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/67440218642.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/zetubof.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/zawovu.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_off0000c0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 18956 bytes
SHA-256: a76fb1e7db1d2787b966338aa9b2062bb8fb1a835be9d17c49854124f173e6f1
font_02_sfnt_off00010ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB9 10872 bytes
SHA-256: 8d77f02fd261618661f689f54702bde2c53b1b152db042a6902db31a62b9daa8

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