Malicious PDF — malware analysis report

Static analysis result for SHA-256 404a6b3b483b3477…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 04:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02e7af8c438a89b2142fc3335de06e70 SHA-1: 4d27470a4d46e3ad1fa92278c53b71fc5fafa92f SHA-256: 404a6b3b483b34773e8156201b8e991e265b851e14081f4e7d0d8a83e8527bac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to external malicious resources.

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://coretry.ru/uplcv?utm_term=multiplayer+games+for+android+tv PDF link annotation
    • https://h1t-urlaurora1-turbo.com/contents/files/23121218169.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/26472970036.pdfIn PDF document text
    • http://synphabase.ch/upload/file/64231251679.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/juwotivimoturidevokipadid.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f442f09f06---98769064879.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/33408393232.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/vupazoloniko.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rurakowufeganaxuxubaxepun.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/rodorugufineximotigowid.pdfIn PDF document text
    • http://anpharma.net/upload/files/tetupopasabepen.pdfIn PDF document text
    • http://soles2walk.cz/data/file/69466352005.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/najerezerixagewovigebok.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/viginozepimivotogusexu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca3a3eccd---50661729086.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/38204647774.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/sixizoduvizo.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/92537850638.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///rovizaxugusatoxananipolum.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/widagoxupis.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/5367779909.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/91054776950.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/57508586725.pdfIn PDF document text
    • https://zzwgjx.com/d/files/53048885554.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/zupafodikigilusatog.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-12-07-07-56-rm8JlDBi.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_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 16664 bytes
SHA-256: 945c083b90678d270fef3a263df004c3d2245771ced8cf9a11afe5d6a387e13f
font_01_sfnt_off00011ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 11116 bytes
SHA-256: 1ad556cf71b51c2992f4c86362c6e01b7c3fb2c3801a6da5dfd0c2b0b5e2e71d
font_02_sfnt_off0001349b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1