Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9176b8431055449…

MALICIOUS

PDF

87.4 KB Created: 2021-09-23 13:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f92bd028ac4d9d0fdb5d3eb8e2b402d8 SHA-1: e1aef2bd1167c3f08a17ab0ba1790678e553aed2 SHA-256: d9176b8431055449ff6499a512942cc5119eeb94b24b05518988b47abc8ed5b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs, including one that explicitly mentions 'star+wars+ebook+pdf', suggesting a lure to download malicious content. The PDF structure is also noted as a link farm on disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=star+wars+ebook+pdf PDF link annotation
    • http://hc6999.com/userfiles/files/wojalizowusajamadojovelog.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/xozidobikelu.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/93335671776.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/xunigugavenopexirukesew.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/58519240889.pdfIn PDF document text
    • http://rcot.by/pics/files/3442119115.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/nekikexulilamavolumaf.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/xowasotu.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/ziranavix.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613be46113b8f---27930885350.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/42756308586.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/74333274946.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/87329998329.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109031456236659.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/soduzixejakokemumisaza.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/53522522635.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/notuxi.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/rofapovanukajazasobotiki.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/fitolo.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210909_7FF94C6FA53AB734.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/nusaraximudalino.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210918_1F3DF82D10A27B16.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/71250412599.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_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 19164 bytes
SHA-256: ab76b5d721227eaab579f72ae10f424e39c82891055698b288a8fa79c38dab11
font_01_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 10640 bytes
SHA-256: 588dadd6349459976d430bafaeeabca446fcfa0a02d9f2ab6e879237a1e8bba2
font_02_sfnt_off000137f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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