Malicious PDF — malware analysis report

Static analysis result for SHA-256 39190c01b9a5313a…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 10:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb66c339fe13d71c046e1845b844c752 SHA-1: ed0366dad685b4849c6a9138256422b4596e9857 SHA-256: 39190c01b9a5313a46f3f96152f244ec0f1eb88b905173131397f4bb336e5294
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vantainoidia.vn/ci/userfiles/files/tuzisazit.pdf In PDF document text
    • http://ankaraeksioglu.com/resimler/files/92786084336.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/33670216461.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/kixigimoxamu.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/54709922341.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/34857936615.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210902_022602.pdfIn PDF document text
    • http://net-marketing.hu/images/files/mutujalarinaxegadofenu.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/87370270769.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/3826344034.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xadopeloxizi.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/92887515848.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/tuburaxal.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/fajasetedebazote.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/xobogosibakafejovote.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/49287311244.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/fezuxogimuzazubuvapim.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q4bp0iljiaqlofqafjnl8shd52/dezirosid.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/72769673131.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb723b0eab---mixof.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/wipunofojakoweb.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/58915790072.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/zapolixudewedomibigozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=prime+os+windows+10PDF 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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 18128 bytes
SHA-256: e94f300ee4d97e453a95de0bd997cb9fb50bcebc813363ddb4c374a174a8d4f0
font_02_sfnt_off00013416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13416 10364 bytes
SHA-256: 4b2240d2260d83d5d9bd6e084f02c854f6f397c11094166b527e3d0bea9b4852

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