Malicious PDF — malware analysis report

Static analysis result for SHA-256 973eaa52fd2b3335…

MALICIOUS

PDF

87.9 KB Created: 2021-09-15 09:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bcdde764283782d1dc8a5d92391fcfed SHA-1: ad1654ee921cc44b012b737f3b521e32cf362989 SHA-256: 973eaa52fd2b3335ac7f7f4e1426c2dc238fbb81ab8af43c1459375719e3a3a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown domains, suggesting a link farm or redirection to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://vnos.vn/app/webroot/uploads/files/lujesanilu.pdf In PDF document text
    • http://ph-easycome.com/userfiles/file/1708939807.pdfIn PDF document text
    • http://masonhn.com/d/files/derusuwumofaposabe.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/a62cq6bdc19qr34a93phpqm36r/35866679105.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109021204226529.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/tesaligofa.pdfIn PDF document text
    • http://guclupin.com/calisma2/files/uploads/gidunotomimodoxexomigumi.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/90974918221.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/bugisutuj.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/ganizoroguxetunuwafugute.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/76668774100.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/sudepezonobisadewo.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/mifabod.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/kexukivafefadodo.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/7822287314.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/bedaveneziv.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/27789464843.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/87276687435.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b65827b96d---rilufujevufif.pdfIn PDF document text
    • http://tyextractor.com/d/files/66752887554.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/gukofenovubatesunefuxa.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/komimofemamowewibefid.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/72491590854.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/444012189.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/52492288212.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/rebotojode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+mobile+forensics+open+source+toolsPDF 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_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10840 bytes
SHA-256: 169b8e8db93aa1ed24491b26a40c7882a602d334d741814f26e04aab8135d7b2
font_01_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 18340 bytes
SHA-256: 9d46843b8d7415c626e1738a58b44759c38f6715ed51c3cb61ff10d1c9146806