Malicious PDF — malware analysis report

Static analysis result for SHA-256 e149d191262156b5…

MALICIOUS

PDF

88.8 KB Created: 2021-09-10 18:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0aea9824b776685797874d5141295e7 SHA-1: deed39a2bbe7e7c07c506b5ec7fcc962f11f05a6 SHA-256: e149d191262156b5ef78add536a96e839020c892f4183bb7f3571b494d31a4fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, many of which are likely disposable. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://rentaruedas.com/files/others/korivone.pdf In PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/fukogunitojevopasakus.pdfIn PDF document text
    • http://lagrupacio.cat/file/zupelinug.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/wulaveniniwutakudib.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/kutuboxedopimemoxa.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/pozosasapekefoxe.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4i7tbftov11vb4u72g45ob65g2/31311844995.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/35343475135.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/sijesijeduwezozodov.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/tazuvabugutezubabo.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/rokarusoniwisuvixute.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/fesovavigijifijopitenetu.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/12363361406132cd6bdc439.pdfIn PDF document text
    • http://anm-av.de/uploads/files/zonedodubozetebak.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/sijakanutosixelaw.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161358d316f0ab---zegizokejunevevur.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/bixevar.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/bejaje.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/bexonojigikufafajiver.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/pubebelebunodar.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109100222273677.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/wamugilukepulepobivafej.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/gegozamujerukugej.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/poxorova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=substratum+theme+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_02_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 10564 bytes
SHA-256: 7405430dc8caa9cb4550ef46e83fdeb94dac7c56f88497ed9639b6ea076269ae
font_03_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 19968 bytes
SHA-256: 878e4225dc7935ab1d71c08fafa0733b216d96be46982fc26a8ed6949d786533