Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ddd66ad8c8c5c8…

MALICIOUS

PDF

81.7 KB Created: 2021-10-23 10:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5ec7c278aae9b34173bf96e7dc8272cf SHA-1: 49e189ed01204103dbd48855003d62d57a8f3257 SHA-256: e4ddd66ad8c8c5c8ab56f3b77723c702123eacfd3a73cc31dec77da8d120d68a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or host a large number of redirects. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://sogelec-eng.com/files/ckfinder/files/13419486845.pdf In PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/28697949981.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/97636546317.pdfIn PDF document text
    • http://sartor.ru/upload/files/vijinovum.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/zaxuje.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614423ca732d8---66411477717.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/kodixukomuta.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/bifipalasatepeninurikemij.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/rekomapebido.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210907162436.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///sokuzixusadupajuruto.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/puvezuvexowux.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/82392666104.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/42299652466.pdfIn PDF document text
    • https://quizai.com/uploads/files/34700399005.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/wuremidutet.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/zitagul.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/47796304219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=logarithm+base+switch+rule+proofPDF 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://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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 18388 bytes
SHA-256: 6a6ec1b1623059ff211588074745e9e8204f6965effd0818ab24d983131de392
font_01_sfnt_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 11108 bytes
SHA-256: c195e271556612d338704772425962aded6130afd3dc8d308289070c89ac2599
font_02_sfnt_off000122fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.