Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5a1909f429891b…

MALICIOUS

PDF

63.6 KB Created: 2021-10-02 18:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 81fe76a269c0e0829aff128d01b09d18 SHA-1: a77f59b35950ebea6186032c00bd002942c69a8e SHA-256: 6c5a1909f429891b6bce37a58f432bc627527350355dff2270a453365987bcd5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs and a heuristic indicating a 'link farm' suggests the primary purpose is to redirect users to malicious external sites. Although no scripts were explicitly extracted, the nature of the PDF and the embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8486

Heuristics 4

  • 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
  • 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://coopinproject.eu/ckfinder/userfiles/files/19647724768.pdf In PDF document text
    • https://777mto.org/contents/files/33984236410.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/98135226169.pdfIn PDF document text
    • http://hanauhrova.cz/files/79603645316.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/kosoxudizatugev.pdfIn PDF document text
    • https://termoformat.md/img/files/filevofosujuzaxugaf.pdfIn PDF document text
    • http://travellerisland.com/files/73330369855.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/76881206039.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/nubuxebarepasamoxifoguk.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/82229658367.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0350755001632053675.pdfIn PDF document text
    • https://choosetop.e-giant.net/fkupload/files/1338190589.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/333300701c198a2f496da6bc3b80ae47/ponaxelibabutixirajo.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/68996170186.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/68133466898.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/reruduleg.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/dogigil.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b6e9ed2290108dab9ac7bb2aa2d3ee2d/5713738453.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/40125797623.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/toduwuvadifexiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+industrial+organizational+psychologyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC56 16012 bytes
SHA-256: 34b107c5aec404ddec9dad096cd8af453960ee6f9d391c63cf71fc3742c87cc1
font_01_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 10928 bytes
SHA-256: 55d3499a2d77e2019346fb86a2058102ff42ef784f7cd3782d35c8933254b946

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