Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa070cef2171ac8…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 00:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 83bdd2e5cf6c7c1e29a009e3386f8525 SHA-1: 804c5b254c2c811d62d76452c19382afb3ba8ed0 SHA-256: eaa070cef2171ac862d0c410b64496e8db58e0939d72c3d170f65a3d0a2651e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://wastran.ru/uplcv?utm_term=iphone+11+pro+max+giveaway+india PDF link annotation
    • http://www.bongbansaigon.com/uploads/files/vevezemupabesesifupexuxes.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ce65610e---didol.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/puparusidapisudibasotuga.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/34273036971.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2elo32aeos04e2kemv4c1qcgea/46317320783.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/63135017960.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/tixidasulezo.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/jifejebiloz.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/lufid.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/22750352512.pdfIn PDF document text
    • http://yuli-china.ru/d/files/29787257755.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/werufugopegir.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/62422211091.pdfIn PDF document text
    • https://dyaa.club/uploads/file/31701250809.pdfIn PDF document text
    • http://serting.eu/userfiles/files/37770506954.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/xulido.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/kofigosureradanofaraber.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/54416800131.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/1910328856.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/66136545217.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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10896 bytes
SHA-256: e39f86e8c7690c1f277b2a5b8effe195f8db0233517bf172a08791666445d983
font_02_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 23048 bytes
SHA-256: 5ed6dae91b8d84dad2f2447647764bf9fb55835aaa5e76fd33ce7bbf9e4c3373

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