Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e43b4b0578d86b…

MALICIOUS

PDF

70.7 KB Created: 2021-10-08 14:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: be9ede8ccdcfc8ddfc7ca127de04dfd7 SHA-1: 5775007d5f13310e2c704b185ade0e33a2d41ce2 SHA-256: 77e43b4b0578d86b12fce0a108c33a2ff82bc8bb6331e4664d593dcf25bca196
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests an attempt to obscure the true destination or distribute malware through a network of disposable domains. No scripts were extracted, but the overall structure and detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://tybistanbul.org/resimler/files/15125384444.pdf In PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/zevowajisumiw.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xexajejobe.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/peguku.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210930_1B795C9BD260B272.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/febuvosolez.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/7107884606.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/58945844088.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/nukanurola.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/92911268690.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a77865b79---73087242272.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zixize.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210921104306.pdfIn PDF document text
    • http://montesantangelo.it/files/files/kulamekukugijerut.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1615708f753a8e---96697704193.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/7264739328.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/72186782258.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/23808824796.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/paravipujoxebixilezam.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/fifasopos.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/sitifikekekadesumega.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/54597340341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=300+yards+into+metersPDF 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_off0000b65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65C 10672 bytes
SHA-256: 21f8c90365fa7df5f151437c8ca7645e68604d347ce1c7963690e63b1e20af3b
font_01_sfnt_off0000cecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECF 15132 bytes
SHA-256: cde3951c28f7a6479dd5c8bcd7959ef7a1952f253f1000d847b344ad5924f840
font_02_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1