Malicious PDF — malware analysis report

Static analysis result for SHA-256 2499f69a4cc19b3f…

MALICIOUS

PDF

77.2 KB Created: 2021-09-25 14:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8d8c1a55944ab33f717b2676bde6ced3 SHA-1: 31d121ef415159747b4a12503935a555e8473124 SHA-256: 2499f69a4cc19b3fb4cb658a4679d98bc53cbff253968d1b3dd8d181779d44a7
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, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://budapestpainter.hu/ckfinder/userfiles/files/tapobobuwesofiviwil.pdf In PDF document text
    • http://orlickachata.cz/files/files/49722058988.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/tirimivitij.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/movevumavisov.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/68117083656.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/igpc604rr6d8dfph3ihl5sm630/kusebolewix.pdfIn PDF document text
    • https://costarica4d.com/contents/files/6426641070.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/gilizigikegisolu.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/55256408722.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/fuxiwudewolovipe.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/35733915582.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/binatogojajigebapukon.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/mekaposifixewefom.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/sonew.pdfIn PDF document text
    • https://signika.pl/Upload/file/xufobatefokajos.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/98899572823.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109181523484702.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/99141104186.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/kanimupakipuw.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/bafuvukamulawef.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/17402376606.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/vazijogejabutamekareno.pdfIn PDF document text
    • http://espwireless.net/uploads/file/suzikejat.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/xuworopinibomirefugabukol.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219123954.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/burukilatajiki.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/wixoxuzufowabulej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=zombieland+double+tap+streamingPDF 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_off0000c218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 19916 bytes
SHA-256: 4f42573e80ad352e8f4f14e6d34dd42d2e952599b691f81da011473da307f1af
font_02_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 10940 bytes
SHA-256: 88e275564380065f8e96b58053db84296b11ab1cadd9ab9cbbf964c1baeae914