Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad5ed69478c2812…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 10:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75aca322331d0173f0e0dfacf93d91b7 SHA-1: 834f7ed6b3ee72001b0eab880ed6eac5e5129914 SHA-256: 1ad5ed69478c28122fa95c8c1ba221a893a1ed5f0b187667750cb80705b20cfe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and external links suggest an attempt to redirect users to malicious sites, aligning with T1059.007 and T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://cructi.ru/uplcv?utm_term=instagram+view+private+profile+app PDF link annotation
    • http://tamlaproject.com/userData/board/file/tegibofitukodijupebalepe.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/34897501002.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202192050568848.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/20839163348.pdfIn PDF document text
    • http://midel.me/userfiles/file/4195899097.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/wiligisazajepe.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/jexilifejemid.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/gakofilinebolagifitanirex.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/5800239918.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/xavixewijanomofarabop.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b92ebbf8---5903288979.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/vopabukijusekudasebibex.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/96193781810.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/fafumomukosizu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b83cbcffa5---fowituramunumi.pdfIn PDF document text
    • http://minhanh.com/files/1060653858.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/5587844720.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/62557817459.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/17851412773.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/kevegaguviri.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/4685589341.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/lofeloguxopijivulumowarad.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/xenura.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/65162281520.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/90783664799.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/38326880369.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/jidenalunawu.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/15968222667.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_off0000b609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 10804 bytes
SHA-256: e474d5152a80db9a4a545f575292b8c5ad542b8cbf88f09c86ebb37d3e31f489
font_02_sfnt_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 14716 bytes
SHA-256: ea241f7431810de1c843fc1ffb0edb58de40249cdcf033aa0efc3d524f24d296