Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5138e9576b6753…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 03:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 70bec1b0f6eb619bd8209369f32eddd1 SHA-1: c05c85fe16fe6c50d7c2c85ef944a422f1c620c3 SHA-256: 9c5138e9576b67534c4ac96a6d66cef8bfddb12de2dedc2b8e413fc15584f667
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or spam distribution. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, designed to redirect users to potentially harmful content. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krukaiart.com/userfiles/files/93351535140.pdf In PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/54654385782.pdfIn PDF document text
    • https://kaparatt.com/images/File/tefisefitodo.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/67913706371.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/13829942714.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/9649717853.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/94621729393.pdfIn PDF document text
    • https://braus.uz/images/shared/file/47581142966.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/57370479546.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/4079993790.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/fedimaburagutaranon.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/9096617047.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/40774063198.pdfIn PDF document text
    • http://hbaoge.com/upload/files/lesino.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c71b316b1---midag.pdfIn PDF document text
    • http://sung1.com/upload/files/49170723134.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/29131804118.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/gerufisiminuguninakuzo.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/13979883463.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/perolibusikajiwiravuxesap.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/4773749185.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/12499308619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=coastal+management+strategyPDF 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_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 10504 bytes
SHA-256: 67c51ebc2d9dbf1dc1040511498b3d89f80f5e8019fcea7427d1405e9c82658d
font_02_sfnt_off00011814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11814 17364 bytes
SHA-256: 2b302574bd64d21be60c2e3e9400aac625052a61ce543fcddc85fee9fc9cf9d1