Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e43cb0c59f7462…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 16:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab64d7c459f033bb6ddbfd0d0c573462 SHA-1: ead62060d228ab7b7b194ca88c3cf65cea2d9d05 SHA-256: 55e43cb0c59f74620a5197dfe03d149756c47ddefc3de5d3f89e92cb72cf9927
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, and the PDF structure suggests it's part of a link farm designed to redirect users. The primary attack pattern involves luring users to external websites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=android+phone+show+wifi+password PDF link annotation
    • https://clubkdo.fr/img/pics/files/4379897721.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/budedizajosekoluwojatuw.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/32235881546.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/5760219122.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/naxokakix.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161390d404b233---78569291678.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/34007331145.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/povedesiweriwopaxukaka.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/bajenobolave.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/19974150437.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/jegex.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xoveboxuwowa.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/fosodoxefokeverole.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/77859916887.pdfIn PDF document text
    • http://zl369.net/userfiles/file/koxatuvolodonojotarojirob.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/vafabuwuxarugoje.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/razus.pdfIn PDF document text
    • https://invest.pl/userfiles/file/252055661.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/rawifewikudifanufinizo.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/62060173317.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/susoxewewogulejizuzi.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161368a3b98f22---30480521302.pdfIn PDF document text
    • https://norservis.info/files/files/84359287964.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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 10516 bytes
SHA-256: 05ab544627ecafbee8e3acb7e7705bc7fbf1d120964bf5e1692ad1374cf3d5a2
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 17620 bytes
SHA-256: 6b8f3bf05f44ad2c97b9c1e80f63b631aa01f4723aff2544d6511b3e50bdea96
font_02_sfnt_off00012be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1