Malicious PDF — malware analysis report

Static analysis result for SHA-256 6605aa0325d34f22…

MALICIOUS

PDF

71.4 KB Created: 2021-10-03 14:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f8034693b6b7a8a1f05f8ee6d6b849e9 SHA-1: 56578efa7fe676d2044c47a47bfb21387c45504a SHA-256: 6605aa0325d34f22e3ede971bf67a0c06a87de9003ff3cb366cb6da0bc29e921
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to distribute malware or lead to phishing sites. Although no scripts were explicitly extracted, the presence of numerous unknown URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161543f2721681---64177992242.pdf In PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/53645947493.pdfIn PDF document text
    • http://patroha.hu/file/79260553952.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/68148353607.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/46150745221.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/80533071217.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/7142839799.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf452e796f---78028017980.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/87236510707.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/73335680181.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/52225338270.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/97262020048.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/17539482611.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210910065619_ycln6j.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/nebokurulubesez.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/72123262484.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210927_DEA7B290D5DC42CA.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/49148816252.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/26166971715.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/10901030400.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/95944865578.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/71831215103.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/zewofuvavexiz.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/32595750112.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vusevosodadewatisiko.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/66405306384.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/90012760664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=statement+of+comprehensive+lossPDF 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_off0000b69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69F 15600 bytes
SHA-256: 1298a40db14890148800637d4e31e502cef8f166910d56a76bade09231eab565
font_01_sfnt_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10888 bytes
SHA-256: 96b32d3f417da5900abf3864466f1d97b81f4a54b89b4b860e8139f8112ba2c6