Malicious PDF — malware analysis report

Static analysis result for SHA-256 944333f2b68f7317…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 06:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ca3685fd4900384d194e241a92cf13cb SHA-1: 2de683d3f49a0038e1f4f8c450b871d6fc59d419 SHA-256: 944333f2b68f7317520c8a65637e0b4a360ef064487c41b0c3f6fbd7206b4b03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous external PDF files hosted on various domains. This pattern is often used to distribute malware or facilitate phishing by directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315173934df---84138505581.pdf In PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/3408917520.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16307705878455.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/26247629359.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/87008252488.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/romovenagapawuzevo.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/mosobuxit.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/82051393338.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/pisozuxik.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/79839429211.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/60391093742.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/piraxuma.pdfIn PDF document text
    • http://brenderup.ro/mm/file/pegisajefabusima.pdfIn PDF document text
    • http://www.siposferenc.hu/html/24221547172.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/nuzaxumumabojofezexa.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/zovifewo.pdfIn PDF document text
    • http://serting.eu/userfiles/files/xirarojufepanusotapul.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326d216ff9d---tifakijizeni.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/56284849584.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/72576122332.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/zitovizetapimuma.pdfIn PDF document text
    • https://o-dance.com/upload/files/vemivo.pdfIn PDF document text
    • https://ienter.bg/files/2061777692.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/junifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tubemate+2016+free+downloadPDF 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_off0000c163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 17564 bytes
SHA-256: 29f7d6028d3bfaef257cf76e345b6a16854cdf8bc1e6ee5078f27e9417fb51e0
font_02_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 11008 bytes
SHA-256: f0bc8fa75b221777ed48f6bd9bffd2130ff7882e9ad658162a1ed46df47d0ad8