Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bc446f54209a11…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 17:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea813f66fb3aae9f36050960c3dccdd4 SHA-1: daf789b68c993e4e543d609b97e35d7e2a648c93 SHA-256: b3bc446f54209a11db76e3af2567655dcb63fad3385cac298a4134aa8b76f70c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

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://crysiq.ru/uplcv?utm_term=how+to+transfer+app+from+ios+to+android PDF link annotation
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e862627e8---17923180097.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/vopanesute.pdfIn PDF document text
    • http://mdtrend.hu/files/file/14964168082.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/xofivowu.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/wagutinopolazenoxepo.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/mururepakadobiwejuz.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/15969447705.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/21098548602.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/zizavigusasasinawakajul.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/ruminisurepuvoxujelufi.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/batizuwudoluwerovegugi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bae653fd2---53175727572.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/xunowofogejumadilajeluw.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/83356159993.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/divatoguwizamusoxe.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/tazipapurisufuxebib.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/77366453060.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/27975308887.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/84362658600.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/42808945896.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/faditidojuv.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_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 10692 bytes
SHA-256: a1c0f00b583c33cec3a1fa0f5d648fe59e6d864c86fdd9992b80bb6c87f99235
font_02_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 18544 bytes
SHA-256: 04d6f25827a75036a2cb06c25d08ba013c074b1813b2f7d603979a28bd468419

Open this report in the interactive analyzer, or submit your own file for analysis.