Malicious PDF — malware analysis report

Static analysis result for SHA-256 914fa454d3f83c85…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 17:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a671a6beb29b322935521bb605896c9 SHA-1: de61382ba0395064e4d7b6da2dcb4d4801b5c1d6 SHA-256: 914fa454d3f83c85f65f7a781825099de8941af19058a123e05fa9aa0b7a2b15
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using many links on disposable hosting to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=romeo+and+juliet+crossword+puzzle+pdf PDF link annotation
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7bead44f6fa6e6e94f3f1748b1516779/1669561861.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/soboxifezonewijarebon.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/44742757707.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/rovagebovizanev.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613495940fd7d---kugetan.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/mubuxekaragifezixaweso.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109040836071024.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/88248330260.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/69067952644.pdfIn PDF document text
    • http://m2m2design.com/userfiles/soxepunadagawuponu.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/43413164066.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/biselafagotarabibokaguxu.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021951445433558.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/83002423983.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/lokobez.pdfIn PDF document text
    • https://jck.ro/userfiles/file/zitarebupepuve.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/66604844031.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/33250630136.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109090557009857.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/kotasug.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/bopojikujutod.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/18543518086.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/wokavuledukugixowodaregir.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/zunomixojezilofaxunarize.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/87004666161.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_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 16924 bytes
SHA-256: e511c7a662e845592ab638b8bc644a707ce25f47f478414df83af15f232ab920
font_01_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 11200 bytes
SHA-256: d1326426fea3f29f99a9bab66eedf42c13eda23bd7d23a9b6eb232613aa6e4cb
font_02_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1