Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea0dca8a7751d46…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 06:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3039e2898fdd185ead3f1ac0fa340f4 SHA-1: 53751a409fa6dec652c77631d1e02e142b15faf6 SHA-256: bea0dca8a7751d4617a67ef5459c0b1698c7991d5c673f0a96999de84451bb5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing unwanted software. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=adobe+photoshop+express+pro+mod+apk PDF link annotation
    • http://huijingweb.com/upload_fck/file/2021-9-6/20210906033650853875.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1502b012f---kovirawamoxavu.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/mebotizajeguzezabezeduja.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/90850944321.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/27457235324.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/lovaru.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xomawaxu.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/49144636310.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/69163312421.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/20107657366.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/88537103123.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/63177099585.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/tarafo.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/nosolewakavaxezudoru.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/56687320921.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/batofowujekosa.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/51538448101.pdfIn PDF document text
    • http://snsi.jp/image/news_file/26192371070.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b96f2a47a---figijezukujavuxiduvak.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/9691297504.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/94901537230.pdfIn PDF document text
    • http://fructusartis.com/i/File/lebudufoj.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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 17116 bytes
SHA-256: 6dc8306c9700050a6c261c72e48f8c6ff231ad169804ff5714788c3e1906dc93
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 10732 bytes
SHA-256: d350b8dc7918f770d5141e7fc4b272d3ac9587d948b9cc5b84916c5af5632d40
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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