Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6e85d936806d6f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 09:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7c1e1088ed00a93b3d363d94b816ba83 SHA-1: 85352e56c3a1862f0801708138cb8c862a2331dd SHA-256: bc6e85d936806d6f26b9a7bd9509dd2455b9178909a8b11d2b8caedb9f0ff384
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to various domains, many of which appear to be hosting PDF files, suggesting a coordinated effort to redirect users. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically highlights the nature of these links, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://altadirezione-consulting.it/userfiles/files/bepusenomolu.pdf In PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/vudomevixejamog.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/budezetasuvuxonaka.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/litavotegatu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/55993132387.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/boferevi.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/55864171660.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/binulimi.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/gukuwex.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/19511227780.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614047f877beb---nunisuf.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/82512135912.pdfIn PDF document text
    • http://candientuvibra.com/images/file/soxoredelokusilitira.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/memanezame.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/gekotusekekilaxojon.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/59219361661.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/tubewaw.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/kugadoliwogawaso.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/62270575709.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/31673741431.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/nufelunefisegimikebu.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/loviguxa.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/5904821588.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/50356096477.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/nitibogimimepufinor.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/betamedojijazomi.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/bavofetape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=earthquake+coc+wikiPDF 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_off0000b180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB180 14936 bytes
SHA-256: 24684a427ab742380ba82f21fb20bea5ed55cc2d41052b6a77b460e403747e6a
font_01_sfnt_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 10416 bytes
SHA-256: 574ab6d38ddd4b41577629136421eea0b49edb8c96525842bbce748b3b3a7c3c
font_02_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1