Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb31e8397ce68ef…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 10:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6227c0e2a6027bba3777efb013c2773a SHA-1: c5c20b8b18ab6f4c258f89c3270e81062b683f36 SHA-256: 8bb31e8397ce68ef7a62c400a9d617cca372ae16b0c134971252500e0688540f
154 Risk Score

Malware Insights

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

The file is identified as malicious by ML classification and ClamAV, indicating it's a phishing or trojan PDF. It contains multiple external URIs, including one pointing to a raw IP address, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=how+to+download+new+update+free+fire+in+50+mb PDF link annotation
    • http://ascensionchina.com/userfiles/file/76457480356.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/75941118428.pdfIn PDF document text
    • http://tianfonmm.com/d/files/biwixunumonupupemuxugur.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/76785157749.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/zofipawisorapukuriz.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210902014345324502ajp8gpp0ue6a.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xenulunebuposared.pdfIn PDF document text
    • https://isleo.com/i_photos/file/52918620375.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/22047783646.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/finit.pdfIn PDF document text
    • http://a-pluset.com/userfiles/nuzeburoxid.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/40891997847.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/veropozarilituvawuvujivon.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/xafezazebenaset.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144ecfbe168e---tanozijuvunusowasazage.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wirojarova.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/wumikizosi.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/dilitaxowagozugu.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/dipunuxiduwusemun.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/25182856424.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/xubuximidetimuzabofeb.pdfPDF link annotation
    • http://studioguidobarbieri.it/userfiles/files/99241180567.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/bomitowuj.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_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 17028 bytes
SHA-256: 10bfa854ab502d9633f401a4583009c236a7d2e3336d5e647877be7bb3442215
font_02_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 11064 bytes
SHA-256: c5b2d477d631df8d751b2604e60dc4df47e5830eb3dececccaf14fe500effa2c