Malicious PDF — malware analysis report

Static analysis result for SHA-256 20aa94babfba7ab4…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 14:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 85a2cb4f69c855537db0c0b762e5f4fc SHA-1: 94a278d1179e99455128eaae81be639cd17f4dcf SHA-256: 20aa94babfba7ab458e93785b9e4dda0e1b008d7eed527d162712bac95029a5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to unknown or potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://jdsliquorlocker.com/nbloom/fckuploads/file/tonakimuj.pdf In PDF document text
    • http://rnralpha.cz/res/file/xikalivixarewogefebanebup.pdfIn PDF document text
    • http://aven.su/userfiles/file/88019419773.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/vumiguxojakese.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/muvowetiwibevetategusuna.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/27592321996.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5c8b6c93---14218176012.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/41879813977.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/93083133747.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e0bdb6b1514af22a245ba12094809188/kezosifafupixosaribud.pdfIn PDF document text
    • http://travellerisland.com/files/padodezenemogur.pdfIn PDF document text
    • http://chpcentre.com/files/file/zafuwabafa.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/buforufiserasobudatuto.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/bikemiwaralaxomasugovuxuz.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/88618605594.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904184710723863.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/relojituwa.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/1752944619.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/23356939078.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/gepamekewazix.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/jiresabo.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/sopob.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/kikanelesola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=friday+night+funkin+multiplayer+download+androidPDF link annotation
    • 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_off0000b0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B1 17648 bytes
SHA-256: 8404be4ac6ffd3cb7333665a1477cf469128f01ce187adf12b274769015a4632
font_01_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 11144 bytes
SHA-256: 7e5d10a0683d870502382027e3c8c1fdafb4a0fc184323069cfca8bb5dca526a