Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc9d0fced2235f6…

MALICIOUS

PDF

73.9 KB Created: 2021-09-21 03:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c492eaa02091bfe1ba23f9b1f76bf169 SHA-1: 7d3c1c723606005881dc43d81e12573fb7fce0ae SHA-256: 2cc9d0fced2235f61a4d55963a8e5136c19bf33969d5b05bc037391e0e2be773
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://goodfortune.hk/UpLoadFile/file///68233271586.pdf In PDF document text
    • http://drironcat.com/images/file/99775655058.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/remonowutuziwe.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/83052527306.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/43148980116.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/lusexif.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210905005314.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/55246052911.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/gibinufevorilemilatok.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/tonetagesebuz.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/veketugobajujidimibemexu.pdfIn PDF document text
    • http://sartor.ru/upload/files/ribufedoroge.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/9562964351.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132588537074---pasokozumaxozem.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/58494561282.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/jafedepupurirojukira.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/6015820191.pdfIn PDF document text
    • https://brakos.it/file/gubutasufavufikog.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/10329227703.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/dulaxuxitisidatisofe.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/ruvuxukofomosopasila.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109011222173186.pdfIn PDF document text
    • https://penal-garazh.ru/files/27745641535.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/digirebetoda.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/84897837215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=installer+les+application+android+sur+pcPDF 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_off0000bd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD58 17104 bytes
SHA-256: ff288e8302792adab27970ad468fc483fd800d85615ac789d177fc28fabea3f3
font_01_sfnt_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 10560 bytes
SHA-256: 8fadcdf2a207fdf63f4e5658ee154efb2bd5c71b3be244fc31f78b655946b2f5
font_02_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1