Malicious PDF — malware analysis report

Static analysis result for SHA-256 36754f62a70f361d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 00:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b019ebee0584577a989a29a2a0f13d51 SHA-1: b0c47be291fb176523e4a705bc0fb1fafdf578bd SHA-256: 36754f62a70f361d4b3ca526e934d6da14ef093f12fbef779eebc505eb7b7b56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is used to distribute links, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure itself can contain malicious JavaScript, hence the T1059.007 technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d46e36dd99d509f91d1f47c42ca9e3fd/59088218741.pdf In PDF document text
    • https://binhvi.com/upload/files/33042194885.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161302321f30ef---vetagaxiromedusalupet.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/64798984671.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/pavikatafinulu.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909170416.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/fetuzuxuwekawisedusiwu.pdfIn PDF document text
    • https://windsbs.biz/files/file/13417909427.pdfIn PDF document text
    • http://all-premium.com/user_file/files/52245996697.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/79951285304.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/99831533183.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/6352072018.pdfIn PDF document text
    • http://abnicum.com/files/file/53810302372.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/85846812170.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/jebapizegujapijojesogava.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/zobugez.pdfIn PDF document text
    • http://asvpp.fr/pdf/wowam.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/wasaruvasukugagovufipedo.pdfIn PDF document text
    • https://remini.hu/userfiles/file/varununofegidekavusuzu.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/44650418625.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/resowalewulegoxofagasujox.pdfIn PDF document text
    • http://thaifilmind.com/upload/files/97727649604.pdfIn PDF document text
    • https://soechi.net/userfiles/file/romaxoxavur.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/38874263687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+factory+reset+an+android+devicePDF 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_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 10680 bytes
SHA-256: 79efd125e4e23f90b25e0a55ca81c33665b82a12e9adae7650258d0a672b4525
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 18820 bytes
SHA-256: 4199ef418a5c02d86dbb19fa3c9da2a40b0b25cdf66cf880ea9be31cccb91153
font_02_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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