Malicious PDF — malware analysis report

Static analysis result for SHA-256 935c4bcb40301467…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 04:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10d60672b7188b079482ca83cc7838cd SHA-1: bb09ffb74f8ed1b7275388166984b73ca5b9410e SHA-256: 935c4bcb403014673fdf593a8cca727c501835ba63add3f7998384bde619f420
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous external URIs, including one that appears to be a redirector with a UTM term, suggesting an attempt to direct users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=maa+durga+live+wallpaper+for+pc PDF link annotation
    • http://barcelonahotel.vn/UpLoadFile/file/gabevimenugut.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/47727185508.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/lilizufezesapunubesine.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/ziromopudogaj.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/aioh6rocg5pcl4c3fpb3sn9ejp/94254289685.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/18315546977.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/ronusuropiwif.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/mizesu.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/setemulisasiku.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/71013907589.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/gemilebewupopoxidezonosa.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/98353080368.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/bopomowofiferom.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/bc7a2e69d3276b7309eb0f24cea6bfc0/6026284870.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/48536109325.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/pevunitek.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/napegiru.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nawemapufa.pdfIn PDF document text
    • http://pactolous.hu/upload/file/vaniwenifaranaba.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/52217782456.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/66430276010.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/lopiwulewotibal.pdfIn PDF document text
    • https://superpart.com/files/daziwenofisajenu.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kuminemesi.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/lidozepejawinapuzezew.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_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 16776 bytes
SHA-256: 1cbe044e9f19cc6750305fc14b77c8886e65206b03d38a72ad9c2fdae2841fd9
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C5 10668 bytes
SHA-256: ce9c8469bc2e57b9b3016da8b32c9d2f3d19de7e8d0a46deab6ed6485ea12f2e