Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef4ac08c2d72519…

MALICIOUS

PDF

75.6 KB Created: 2021-03-03 18:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24c5e6c062c5c3b87e7cfd861e761b74 SHA-1: d090cbc89e566443d405c734092233a2ec3d5f15 SHA-256: 6ef4ac08c2d72519aed15f9eb31e8b19c1bca29346de30737d253ee911065798
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=edelbrock+1407+manual
    • https://static.s123-cdn-static.com/uploads/4372085/normal_5fcf4921a40f7.pdf
    • https://cdn.sqhk.co/rizijuwet/JMjjehi/hearts_fc_stadium_tile.pdf
    • https://cdn.sqhk.co/ratosakip/ixFFgj2/99870590747.pdf
    • https://cdn.sqhk.co/xovijanovupu/Dc7jbha/top_new_ringtone_instrumental_2018.pdf
    • https://zuzumesagodufen.weebly.com/uploads/1/3/2/6/132695194/toguvetapuse-rakiwepoluxu-jigifijemiwet.pdf
    • https://cdn.sqhk.co/gepabafi/ifjcthi/automatic_change_desktop_wallpaper_windows_7.pdf
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/6c42f65.pdf
    • http://majelogajizivo.iblogger.org/baofeng_uv-_5r_operating_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4459917/normal_602975daab614.pdf
    • https://cdn.sqhk.co/jusulikipe/YjbicVf/furia_de_titas_1981_assistir_online.pdf
    • https://cdn.sqhk.co/buzomesil/5xijKWr/video_download_for_opera_browser_android_apk.pdf
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/pawamu.pdf
    • https://cdn.sqhk.co/pejinijew/U5V9Bge/ethereum_games_ios.pdf
    • https://static.s123-cdn-static.com/uploads/4465392/normal_5feb8da1e8b51.pdf
    • https://cdn.sqhk.co/fegadosijete/ighetha/laxibifixugozisabekadik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuzugimekiwetad.epizy.com/48268260367.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd80.bin
c952612ef1470db5b40a0a443d17c74d94e9593a60cdb0ec6ea5f23e885df19f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 5432 bytes
font_01_sfnt_off0000eff3.bin
959ba0aa9a3879bc60cf998f67a3e5f8125acd839a637ae5ccb82a4347df8360
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 15392 bytes