Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf6c285e638ea4d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-15 18:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d5fd17fbb4a19b614e58da3a10ed3d9 SHA-1: 87c53d63a3c294313ea3577d307b26fe6b9f4a1c SHA-256: eaf6c285e638ea4d00c90ef3802b636030bcdeb9c1f301f04a90e7645d63d3fa
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous embedded links, many pointing to unknown domains, suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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 https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/17741018118.pdf In PDF document text
    • http://www.heksan.com.pl/file/laforob.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/5386935768.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ffanouib9spm38ee66hf9m0p9m/zokofezuvoge.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/31614782149.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/lisojozodinubo.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/mirojosimopamovizafuxe.pdfIn PDF document text
    • https://limsurdua.com/contents/files/67535492843.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/gekimo.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/fepawozufoketuxe.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/fabd07397d3cb5957b04f3976452c4d4/52569254880.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/vurelekujapudenap.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/49033946798.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/bafuzufaxatumi.pdfIn PDF document text
    • http://ciskmv.com/css/file/45555980688.pdfIn PDF document text
    • https://subded.org/userfiles/file/65389294364.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/74533874803.pdfIn PDF document text
    • https://parkettworld.com/upload/files/pelirovovuwutabigoj.pdfIn PDF document text
    • http://compsult.net/userfiles/file/bodowufidepesoxuvuta.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/lulusafiregadu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0bdfb6ca5---5360359613.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/wosubapasixej.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/151714413561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=thinkfree+office+mobile+for+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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 10668 bytes
SHA-256: 30923c3dcdd6c0cb9855aa3686dc269526a8cd804155f74224705b06f211e49f
font_01_sfnt_off0000caf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF6 18868 bytes
SHA-256: 9d6f7503d2f0ac28048475af0e30e034fe8a00197939238451b609d328268931
font_02_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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