Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d01cb87efb3ff5d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 04:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed00676df73b2fe260485adf4161b71a SHA-1: e3bb549a279c1a5bfba06bde8125678c035ec6f3 SHA-256: 5d01cb87efb3ff5d264dac7c18f52e33162972e876ed714424b2effdc3bb83f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The presence of a link farm with numerous disposable URLs, including one pointing to 'kewowatitivagerarugi.pdf', suggests a phishing attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 5

  • 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 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 http://www.verneteco.com/ckfinder/userfiles/files/kewowatitivagerarugi.pdf In PDF document text
    • http://hytechcommunications.com/userfiles/file/86940399551.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xatele.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/sizerugemevujodolupa.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/44884063951.pdfIn PDF document text
    • https://ahha.az/userfiles/file/38810045623.pdfIn PDF document text
    • http://seto.cz/uploads/laxutu.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/66187697771.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/36803005846.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/39203523747.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/37324319031.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/buzepipivabudajizafaxemob.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/43051678932.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/binerizarenisawuzivipeko.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/mepegawowowukonakif.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/pulubaligumetavuxig.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/dasogijen.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/bujivuvinepodikajetopil.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/78347852136.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zonupafoberaxusi.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/rarafe.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16142c44721cbf---zasugotebeveri.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/10180155163.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/45006044066.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b586f495fe---98308464560.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/63717967794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=audacity+download+apkPDF 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://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_off0000ca2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 10480 bytes
SHA-256: bd8962680b6c644f9fb97a6a71cc11108f5b0290a8d768c7361d373d1a46c812
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 18396 bytes
SHA-256: 4a51817f6c2148a617d41d595fae6e4b523a07a8f221946ca48e2ec6c54d0a21
font_02_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1