Malicious PDF — malware analysis report

Static analysis result for SHA-256 355693ed74c0cc66…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 09:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2319aecd281e1244c7d1a30bf22016c1 SHA-1: f87d587126b5016057ef2b52262a9044785e0892 SHA-256: 355693ed74c0cc667f40bfa3a031bcbb29a899768e0af13f8647f5a0fedf589e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, suggesting a link farm designed to redirect users to download sites. The presence of external URI heuristics and the sheer volume of links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=pokemon+unite+mod+apk+download PDF link annotation
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4b001af33ffc083dc491feee321f889c/boxirito.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/nisefonaj.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/88429500544.pdfIn PDF document text
    • https://digireg.li/upload/lazimoduj.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109050625309006.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/8809739033.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/tilezurujob.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/lavevasipatafulodulu.pdfIn PDF document text
    • https://senegal4d.com/contents/files/rupupene.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/rekojewubidisogukur.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/95491190465.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/65093594408.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/20706710805.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/gukevegajexokalidulatida.pdfIn PDF document text
    • http://hangquangauto.com/files/71117701258.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/navutetubadunirilemusi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161435a4ed52d1---koxusugijurojimofiwizuxo.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/99551002239.pdfIn PDF document text
    • http://tid.vn/upload/files/83162126558.pdfIn PDF document text
    • https://atrax.hr/files/wileg.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16141116d5356a---robedipujepuzujafigoguni.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/girenagokosurutezuruzivak.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/49847448178.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_off0000c46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46E 17644 bytes
SHA-256: 6ae1cad603096e2311efc8bfb82e3cb9caddeac3f9b560d7a708ab7780b938ff
font_01_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 10564 bytes
SHA-256: a7c24385870a73c4bbb1d6158a3b87fc836dbee0bca1e3017180125caa04182a