Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e54fc939d33f2d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-30 22:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c8e7ac8232c510bfec0b78adb8bd3da0 SHA-1: f0105fc7ff261f6e2eab4e1dc63ffc3207e41c8e SHA-256: e7e54fc939d33f2d4fea9b8d3ed3815db02fb50fd8ac31584bbdaf565c42c2fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to domains that appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of multiple disposable hosting domains and UTM parameters further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://coretry.ru/uplcv?utm_term=yo+me+he+llevado+tu+queso+pdf PDF link annotation
    • https://gitedu.in/ckfinder/userfiles/files/31097765464.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/19941750023.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/ferewinamarepiwaz.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/gatejavowapogizinurow.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/7741921104.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/lafefaduwugu.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/duzoroxu.pdfIn PDF document text
    • https://labelmarket.eu/data/file/79605302292.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/wasugafomebesovud.pdfIn PDF document text
    • http://zuche0551.com/upload/file/fotusisizomeneponilo.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/namafojirewuzo.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/zasinebowutogipabivo.pdfIn PDF document text
    • http://jadeite.ru/images/file/giviwolopakovolaneku.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/tenutifobuzewusekov.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/pagemivuxizawot.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/zefagunazewinarusanulef.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304af99a37d---1940350926.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210919010051.pdfIn PDF document text
    • https://digireg.cn/upload/2616075889.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/19651579966135546d3bd05.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/gorojetibojotorivanov.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/63354136333.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210910131658.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/73712657519.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/53401503754.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/zasikuxibifixipifirek.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_off0000c03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03D 19296 bytes
SHA-256: 85fddd326f203a0a99db4ce2bade27f7b73c54143e785272b546f1a786e31008
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 10760 bytes
SHA-256: b1fcc164f6f74a975cbb7e2cc9063535674745aecf5171714f9b026feb7163b5
font_02_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1