Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e8b54ce67acdeb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 06:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76958b03c2fe0c18fe9229a872ab679a SHA-1: 5365c2d402c4c6d5fb60ae647aa00d177a92050e SHA-256: b8e8b54ce67acdebc62f02cab9fed61450cbf7780c375930c86716a2068e2393
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to deliver malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.bash.cl/media/file/89757315567.pdf In PDF document text
    • http://ymmicro.com/files/files/13502501652.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/80496245953.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/30040972390.pdfIn PDF document text
    • https://irantruck.ir/data/file/94298438934.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/32274553661.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/6835285521.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091109052973499.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/41901146018.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/gazevuxirijuvobixurabulen.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/91207992855.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef7497728---44855435764.pdfIn PDF document text
    • http://vanhacollection.com/images/files/jipavaworuxuboweneg.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/15441564265.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/77110653738.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/62650778082.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/22032548855.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/93245310320.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/23859758993.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed362b6a9---28854199311.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/pexazugefebofikiratubolod.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/logezukinutaj.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/34632964969.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/70121350243.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/46079544460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+reset+tv+box+mxq+proPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/posiwebugevesupi.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_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 17920 bytes
SHA-256: 922e936c635e0c10c2ac1d071133483ed92c0f6387f109dc6cd8c69102b4ec46
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 10540 bytes
SHA-256: fcf190e0d4492999e4a3cf9faccd67fa3f895411d1d06d32631e23adbb095874