Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c97892393caa8d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-28 03:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e61d55f857f8d4d21fa3f5cc9b5e2960 SHA-1: 433e00d815269b5ea0ad285070a9e5c0b6d444b4 SHA-256: 64c97892393caa8dd4f42ad9c1f04f821217ca7d0deea7f0a89c1825abcfddcc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=play+store+your+device+is+not+compatible PDF link annotation
    • https://dcimx.com/files/fenerojufurami.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/fakomeg.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/wuvebedilunorebofixilivu.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/56842456011.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/84461554696.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/mewadebewova.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210912025909.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/bokifivafi.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/94090002916.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6e7b9401441f04c3273cb9793f9296b/14812314902.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/46173483115.pdfIn PDF document text
    • http://wwstationery.com/files/file/xidojurazimoti.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/nugemelunabosisugapiman.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/65206887941.pdfIn PDF document text
    • http://adriennemason.com/assets/files/difutaduxifulubirijivigaj.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/zoziwovagezu.pdfIn PDF document text
    • https://huanghecables.com/d/files/nesuwonapogikizub.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/30220479355.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336491009cb---26080003745.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/2887373059.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/42781208158.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/jijuruxekinub.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/jejatenefefemuvukapaz.pdfIn PDF document text
    • http://one9five.com/userfiles/files/pulojomugapudinekexiloki.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/10058159532.pdfIn PDF document text
    • http://technocom.pl/editor/file/64920415930.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_off0000ba1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1D 11096 bytes
SHA-256: ae83b1c4b37e7278fb0aa61bd1963b99f9ac71f1249e2b3cc0bfb0da9285b647
font_01_sfnt_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 17780 bytes
SHA-256: 6561f6efa642d38fa0f1658c8210987e86573c1c4d55798e3eb8beef17bfd08e