Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd21b83ca0697d6…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 00:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b8dd15233bf58c68bc557fd8ed6dc69 SHA-1: fb21e5d8dc372a99fd653071bd7226c89c773442 SHA-256: ccd21b83ca0697d6c2c4964372d35d90146420bac3528738c1023b3901e044c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=gta+sa+root+apk PDF link annotation
    • https://shian-jin.com/UserFiles/files/20301247531.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/wuwaxazobekusavopuz.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109082215339724.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/63062352673.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/48246321163.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/15547914496.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7771c057d---28075311851.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/87594213219.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/13677781343.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4b7df1ec4028ae452bcfe04ef7a51be4/bilexudarudibudolusukuk.pdfIn PDF document text
    • http://steinemann-ag.ru/faruviviretefiliduluv.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/62886861048.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/23507201842.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/60756602607.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/dupitorida.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/21829833900.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/mikawexafizobumi.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/26053415671.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/75485169747.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/8813131249.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/45611181536.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/pevovotazulosovo.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/jutobejasi.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_off0000b236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 10004 bytes
SHA-256: 8a8f6744b3f721895f681b2911745ce6872a11370da97639d3b039d25e42d36b
font_01_sfnt_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 17228 bytes
SHA-256: 34990bb42ac95c9e32027ad5be66091a6e9da325614533d9fb01afe930f74807
font_02_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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