Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2eaa1876b9ce9e0…

MALICIOUS

PDF

74.1 KB Created: 2021-09-15 15:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 409c3b185a770dba442fed118d9cf321 SHA-1: c82c8d2cdffc0e37c71473bb18de14d50d29ab30 SHA-256: e2eaa1876b9ce9e03b95a88b20751683aad11ee7d6646097eb2f242dcf4735e5
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. It contains numerous embedded URLs, many pointing to potentially compromised or malicious domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile strongly suggest an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.tecnobor.com/ckfinder/userfiles/files/66587961128.pdf In PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/76102052324.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/6916220759.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4af84df5---25506930860.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/95661569824.pdfIn PDF document text
    • http://villkasz.hu/editor_up/zukigodezevikofenenur.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/70f3fa1cc8ea1145c77139fe677501d0/86149114443.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/47438117563.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/69256079249.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/28063286393.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109131907432465.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/96454242472.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/gakifu.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/pakonola.pdfIn PDF document text
    • http://koutingchina.com/upload/files/1259939801.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/buxariguxefisu.pdfIn PDF document text
    • http://greenld.com/userfiles/96231564193.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/71072641611.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/sujavud.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/vedozopujejatozam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=action+indian+movies+with+english+subtitlesPDF 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_off0000ba72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 18028 bytes
SHA-256: fd7b1ae53848f2b7984ad5fe4149bf1226e7a8d595bbdfbfc33435fe7dd4273f
font_02_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 11092 bytes
SHA-256: 05bfbc28af1839cb04fbdd83b733e7a167f372f66d5e7e661b5fabe644cc8a95