Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10e1cca573af893…

MALICIOUS

PDF

74.9 KB Created: 2022-05-26 09:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 49b75488526b0853ede3608ac7c09390 SHA-1: a004f71a33f941324f9ed24178de2a0978f69108 SHA-256: c10e1cca573af893da946d63663429b6491fad13bce6d738bc70b0ea3a4df2b0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable hosting services, indicating a link farm for SEO manipulation. This pattern is often used to distribute malware or redirect users to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://tevav.co.za/YmrXLWy8?keyword=missing%20411%20off%20the%20grid%20pdf%20free%20online%20free PDF link annotation
    • https://bugedosase.weebly.com/uploads/1/3/2/7/132712019/df9cd5d1e5f.pdfIn PDF document text
    • https://fuxupetuvifa.weebly.com/uploads/1/3/5/2/135298555/a9b3a5a7d.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/9864799.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/97199603565.pdfIn PDF document text
    • https://xefefukolur.weebly.com/uploads/1/4/1/8/141866352/4580641.pdfIn PDF document text
    • https://nopuxerul.weebly.com/uploads/1/4/1/5/141514765/wedefizise-nojijarodejot-dadinerizeg.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/6714878066.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/19211818929.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/93729414856.pdfIn PDF document text
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/gugagelez_nedavodasepifoj_tokoxumita.pdfIn PDF document text
    • https://xosenevofas.weebly.com/uploads/1/3/5/3/135324499/4512021.pdfIn PDF document text
    • https://gerivelizozil.weebly.com/uploads/1/3/4/1/134131902/dasaxataxorowuziw.pdfIn PDF document text
    • https://topisijek.weebly.com/uploads/1/3/7/5/137512828/mifelapazako_gomoxujedo_fefujasali_xasesefidifusu.pdfIn PDF document text
    • https://tajujarosoko.weebly.com/uploads/1/3/4/7/134749081/544144.pdfIn PDF document text
    • https://nimomobef.weebly.com/uploads/1/3/4/4/134458394/zafek.pdfIn PDF document text
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/5094731.pdfIn PDF document text
    • https://jidobatixinel.weebly.com/uploads/1/3/4/7/134726111/cb8e37a8245.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/vuvefumefajulexidemupoke.pdfIn PDF document text
    • https://xidoferowugefu.weebly.com/uploads/1/3/4/3/134348033/vugiz.pdfIn PDF document text
    • https://kigodebilak.weebly.com/uploads/1/3/5/2/135297846/9675739.pdfIn PDF document text
    • https://kavezebox.weebly.com/uploads/1/3/0/8/130814004/wopul-fepopujurenib-lomubosu-kozonoborapa.pdfIn PDF document text
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/831164.pdfIn PDF document text
    • https://ferakatetimof.weebly.com/uploads/1/3/4/4/134470639/6296133.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_off0000c0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 17012 bytes
SHA-256: 3b78bc2ebd19c006da84d86588abc88f5845366bf32a5f320c339ee219a17f8c
font_02_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 10740 bytes
SHA-256: 8bfd6c03d8e039ec9f39dcbb9a0d5d05ba7fe8c77ee7e550be7ac3fb0f625429