Malicious PDF — malware analysis report

Static analysis result for SHA-256 609924b3f8b64aad…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 13:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5292da9d9ba1252fa46ca7c410d67d3 SHA-1: f65a81b33662c3ed9d4ecf4ce87ac88a8c7e1a88 SHA-256: 609924b3f8b64aad35bce21df354206a1ce7e5431b5dd24e1f00b7bedace7947
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of external links and the link farm nature of the document strongly suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=how+to+import+phone+numbers+from+excel+to+android PDF link annotation
    • http://pcserviszlin.cz/ckfinder/userfiles/files/45998762843.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/tetumimupe.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/divofu.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kinade.pdfIn PDF document text
    • http://noithathoaphat11.com/upload/files/11978649658.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/31455360873.pdfIn PDF document text
    • https://linker.tw/files/nusepipe.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/37626828603.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/91677064878.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/63317837045.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210915201515.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/kunadiwuxum.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/20037775372.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/zanexuxelalo.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/zenadil.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/tusajokarapuki.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a25f975089---4307896159.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/54297901569.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/81337264450.pdfIn PDF document text
    • https://anup.bo/images/files/dadalamifutij.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/21402402547.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/daxovor.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410b512eb88---47908159695.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/61428167108.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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 17868 bytes
SHA-256: 47207f071aced3f476cb19c16ab8562246c618a48348ed04036b87732dbf72de
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 11304 bytes
SHA-256: 58855c8bccea8916ef5d81674088892b5efba6328a66d8d900017a187b3bf4c3