Malicious PDF — malware analysis report

Static analysis result for SHA-256 a651c10cc70a8982…

MALICIOUS

PDF

86.8 KB Created: 2021-09-21 21:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8b85d0ba50df402d354f49a85ee3b4a8 SHA-1: e101d26c4001d79541a7d94ad0bcd1c5e933173d SHA-256: a651c10cc70a89821d9125980911f75231d969400ae98fda46f159e2112e1bb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosts, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly indicate a phishing or malware distribution attempt.

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 https://lombardpruszkow.pl/local/userfiles/file/80477856338.pdf In PDF document text
    • http://myphamnanyno.com/luutru/files/17707322105.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/vexofigupojiritigojuxev.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323fdbaee34---9827685842.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/55048018539.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5b3f537b88b5466b82d8ecf2a9d01317/9302805592.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/87147791183.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/31419113593.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/75515434036.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zoraxodazujaf.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/runojumapa.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/texakolinugale.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/92410828396.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/54811713664.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/59598228340.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/22004407816.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/91075848446.pdfIn PDF document text
    • https://zzhqhi.com/d/files/lofexasa.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/26346322468.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/rigiwamijiriviramelaj.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/67596482913.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xadokufoku.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/fesofanonewiponenujisodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+next+samsung+note+coming+outPDF 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_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 10728 bytes
SHA-256: b3f6227e01014dd34b7dba82b3cd60eb3d2e9483f1d14af08350140a85615ccd
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 18132 bytes
SHA-256: 50ddeda15584c4f2f63ac15743dd8b43caa772946a1137ebde93cdbf42938a2d