Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4e29bac266de34…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 16:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e1704aa9302ca5c98e99bba34447a838 SHA-1: a18b2d10020c1d28f3b1ed7500b257174e9f83de SHA-256: ba4e29bac266de345874436eb29633aaf983b2c06ee9bff129a4599fc83cdcf2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious intent by distributing links across many low-reputation hosts. No scripts were extracted, but the overall structure and URL patterns strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=td+banking+app+for+android PDF link annotation
    • https://francois-daulte.com/ckfinder/userfiles/files/87451595697.pdfIn PDF document text
    • http://poliinc.com/upload/files/laxixewegizumigirogu.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/rosokejasinidipuwoluvo.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/kinefinixipu.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/11992579646.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/48181456481.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/28665225717.pdfIn PDF document text
    • http://vanhacollection.com/images/files/41270241945.pdfIn PDF document text
    • https://dcimx.com/files/kaminopowikovede.pdfIn PDF document text
    • http://scsytech.com/upload/files/japulo.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/koxupomofupifubapuginuxi.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/lenevuri.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/fipebamuminuwupipovegid.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/fizako.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/nokujusewufowijurodesukop.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/32470073395.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161525ce7ca6ae---pesusizarideka.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/39999707902.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f34ea7728---radezeduxisilejanijuk.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/48016685164.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/6980466301.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/57650677197.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/92774407183.pdfIn PDF document text
    • https://bauarch.bg/files/fadukufipaj.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210920_54CF41B873E7293B.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/88152294419.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_off0000b335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 15984 bytes
SHA-256: 92335ff97d3313f36815690af52c8ada2273b86c535c2664c81c4fe1c370f56c
font_01_sfnt_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 10424 bytes
SHA-256: e59cd41499cef7f60e0bb364167e08db367d0bdd18e9d3b5f6bf44d4ab7fba78
font_02_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1