Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ad0f7b6ab33f7b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 21:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c786b7d02fff8052122b843ce9df17aa SHA-1: da0d4f5ffbc86882da5180d10c7d1e2a72f65f7d SHA-256: 20ad0f7b6ab33f7b008234ea659580723144a9b857140cab60b14cb55441a47c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://queure.ru/uplcv?utm_term=d%26d+3.5+spell+compendium PDF link annotation
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0bfe0483d4321617053a07e49d553a06/11003626789.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/12927531121.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/48810614521.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/30312241099.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/nujibegebuvajetejifus.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/vewigoguviv.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/4516335762.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/bulazabanisopudadopazup.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/4007276675.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/zafamawenu.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/foruporakep.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/93686144685.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210902163101_g0hbiu.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19791855663.pdfIn PDF document text
    • https://strechybenesov.cz/content/zemadolaforegeralabuxiduw.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/79818627967.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/6485667373.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/wivoj.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/91482955592.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/nijafitotusosane.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/68467266887.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021921547507715.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/remutufo.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/44333970383.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/59619931350.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210907193626.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_off0000c3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 17548 bytes
SHA-256: 5cd5b60ceabccab10d47d249a2528ec387ad28a8df6879eda2f61679a8262ad8
font_02_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1