Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6c11e858245613…

MALICIOUS

PDF

89.5 KB Created: 2021-09-18 12:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 485152a52d2d91d317dffb511e916367 SHA-1: d3af655c4f24dfe029d67a90e59a35004df7b3cd SHA-256: be6c11e858245613700a2a12b2bc1711885a32eb2c82d0965bbe9d75ce556ad1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ML and ClamAV, as malicious and likely phishing-related. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or phish users. The authoring application 'wkhtmltopdf' is not inherently malicious, but the overall structure and embedded links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=best+offline+open+world+games+for+android+under+100mb PDF link annotation
    • http://xpeedon.net/userfiles/file/20210913073321.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/27064557309.pdfIn PDF document text
    • https://digireg.dk/upload/17056021509.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/kapiw.pdfIn PDF document text
    • https://digireg.org/upload/96588009746.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/miruzepinogir.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/98380811292.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/39926250777.pdfIn PDF document text
    • http://one9five.com/userfiles/files/20811099204.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/wolalajov.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210905230937.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/e5a3879f919e95934efed26534910e1e/7334523975.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/97922188818.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/rabonofipumuleve.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/10301105573.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8e7e4db1---renuradudeten.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/tazopugekozijuligu.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/kudapagave.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210909125218_1671518772.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/kezanubeterikota.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/siwebumogigagejovel.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/pimositolijavu.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/33330145608.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/39539780764.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/zitatibilukalat.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_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 18724 bytes
SHA-256: 6457022e31d3c3c444ac3b095216276b9f7243d676e283510a68b37e0f16978a
font_01_sfnt_off000124c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 11396 bytes
SHA-256: ae6b8737b09e56392fc5e14b1134ac1b1a177a8b6ba039ee0a73b7cebbd78b6c
font_02_sfnt_off00013f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1