Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b055f92d73a1296…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 12:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eac2868eb7d82f4e399a7ef12152cb5b SHA-1: 7f7abf3aba57666a381c74a3371cb6f5371f9ca4 SHA-256: 4b055f92d73a129622a0ea1c5aa39fe27cc5d05cbd96b8b4c85d87d2ef16a52c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=proximity+sensor+android+settings PDF link annotation
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140741c2a61b---kulixozovituwi.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/radiporudeloweziweguvuwer.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/5149000687.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/62428744310.pdfIn PDF document text
    • http://ukrfirework.com/images/file/xalosuwipifogesupo.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/39946113970.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/7416453498.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/voxurusabafukizijevisusu.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/botadakipelipimovixanizev.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/26637443274.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/60927175700.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/jalopudilipurozodal.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/78889411850.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/50577498275.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/topeladidupekada.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/megawu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/0a61r530hhekd8teqbn2e0rb6s/47838198341.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/34489103079.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/zuzepazujumor.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/65768058726.pdfIn PDF document text
    • https://ratodua.com/contents/files/10412588808.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/pexudirelafovexegefiteseg.pdfIn PDF document text
    • http://headrepublic.pl/images/files/31034567677.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/18559543538.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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 10764 bytes
SHA-256: 75bd0540ed18c13a8e4d781395f638b212bb9c335727df2ef89af51d2d23af8c
font_02_sfnt_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 15648 bytes
SHA-256: 440187db20b240432b847f9c63cb101149ecf4de7a0d10130ee3d3c8a51149c0