Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe5bc6c3cc9ebd9…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 08:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b09526859ab6d5ca876153ca2adb4a7 SHA-1: 8f33e4813dfb331a4059b44155b602a17d66a396 SHA-256: bfe5bc6c3cc9ebd9b74750f4f23e7d008cd87a0106651a015fc2fd6345a74f50
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as PDF files, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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 http://taketty.xyz/js/ckfinder/userfiles/files/noxosipuvakelega.pdf In PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210904070024.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/97649506048.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/4517803898.pdfIn PDF document text
    • http://simoncaulkin.com/images/zapav.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/85869238300.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/58548910431.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/fowiwosebinidifutatonad.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/gemidanelabup.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161355e8745403---poxev.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/banamodijisagejopobo.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/vuvuxevefaj.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/nifutaxutasirewulopibim.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/bojorovanadosinim.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/44036502357.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/01114634a16fc144c2ae43c32548ef5e/pigoxek.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/97415943912.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/92394957953.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/bagutaxofenejazagu.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/19183257867.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/25801480193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=firebase+cloud+messaging+php+curlPDF 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_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 19188 bytes
SHA-256: a612e57b541f7d29b96172090c53c91aee3e6d6be282501f3234f1cf2ed980cd
font_02_sfnt_off000135af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AF 11080 bytes
SHA-256: 397df71984bc8e1d80f2cc6ecb28b56a01295e554b0fb7f48f5755e35079b489

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