Malicious PDF — malware analysis report

Static analysis result for SHA-256 9338e7e45a34fbab…

MALICIOUS

PDF

73.3 KB Created: 2021-09-23 08:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5d1e2165f64845a42d323997082ab61d SHA-1: 37bb0e2603d04d491d01f2506210e7562fc665bc SHA-256: 9338e7e45a34fbabe4ec0ddcd85bfa36f24650d20a97cd275a5f11095a77eb08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious sites. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rojadavovivumad.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/u761l4cdao5fseiotkqimpf4b0/nidejajetezewuzomujav.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090514192473499.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/36920995834.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/47818578898.pdfIn PDF document text
    • https://projetovm.com/uploads/files/noputej.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/wafapeno.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/7597860965.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/zokosimu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145be795735a---83471372367.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/54719605754.pdfIn PDF document text
    • http://drtamerturan.com/file/bedumexopotezupum.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/lokitewozuwig.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/jopevavixelexifavuli.pdfIn PDF document text
    • http://teknis.it/userfiles/files/gipiluxurenev.pdfIn PDF document text
    • https://mytopics.it/uploads/file/gonamurodulilavime.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109220732572722.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/tazokodagixuxo.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/timesa.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/zivotijuzojetanatadoka.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/66780847885.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/74583964139.pdfIn PDF document text
    • http://hypovyhody.sk/res/file/rotuvekexudijidiliwaxig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=castle+of+the+winds+androidPDF 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_off0000bbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC0 10568 bytes
SHA-256: 22b6038e87b8fa4051df6249916ca74aadfe0e1b35500766a75174ca0927db96
font_01_sfnt_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 17108 bytes
SHA-256: 3baa79bf4ffedb7c170c1ec370722a58ca0ded171979f73da97d646a9b885444
font_02_sfnt_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1