Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85854f777a2a004…

MALICIOUS

PDF

71.7 KB Created: 2021-10-01 13:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 93d4a4e47f27148fe2063763038818b5 SHA-1: 6d12ad7cce0e9fd276cccfe34fe01bf7cf46d6d9 SHA-256: c85854f777a2a00478ca51911da5e44e4553c1104e27e099820beadba827d868
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent. The presence of embedded URLs suggests the document is intended to redirect users to potentially harmful websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=transfer+data+to+new+tablet PDF link annotation
    • https://ristovski.mk/public_html/upload/userfiles/file/36190316310.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/borozepuzaton.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/ditipiporimelabinogotuj.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/80031332257.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/82245440521.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/tikozadeguxewijepulamiz.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/76384608801.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/44522678967.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/wusunumagimoru.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/32946921315.pdfIn PDF document text
    • http://logicamail.it/draft/media/20331048525.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/52512664471.pdfIn PDF document text
    • https://chv.vn/userfiles/file/vanegamujakanoga.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/58684893085.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/vozufobabegivefavujas.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/50399281268.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161387eb5adc4c---lekupubipajow.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/rulolab.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/fesinugizumokizidukarijan.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/16224012569.pdfIn PDF document text
    • http://hejia-ele.net/upload/2668536386.pdfIn PDF document text
    • https://e-midas.ro/files/file/gemivowuvaxuwugosameziro.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/kifedebisilimasoga.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22152e40402244c0e475b91dde7a3f1e/pibizikew.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_off0000b5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AA 10444 bytes
SHA-256: 5448ab63856bd91259a62e31d3462c01c18fe919fad7f1ef06436247c5511811
font_01_sfnt_off0000cd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 16948 bytes
SHA-256: ceaa6eecc6c74c341150714fb1b53f136028e0294c9fad38c12eff5675c11035

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