Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51468587b77d759…

MALICIOUS

PDF

106.0 KB Created: 2021-09-13 09:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d2bab67ced06dcf6a8c3c56d4bb0378 SHA-1: 407523f6882d11f098035d4ee8566293d62e4460 SHA-256: d51468587b77d75932d39727981655b1016cb455b433537b596ef398245b9b69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous embedded URLs, many pointing to potentially disposable domains, supports the conclusion that this document is designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a269258f8a---79406300419.pdf In PDF document text
    • https://sabagdasarov.ru/upload/file/7418216957.pdfIn PDF document text
    • http://domuran.pl/files/file/viwesatugug.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/widoxamij.pdfIn PDF document text
    • http://rentaruedas.com/files/others/fotagusomamimikivaj.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/79291068717.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/97633511642.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/60884466385.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/munenu.pdfIn PDF document text
    • http://climtech.com/files/files/1978688681.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/kadivaviwoke.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/lakovizaduvujajesorib.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/subixuj.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/dunelunarujudemojetufofo.pdfIn PDF document text
    • http://apicn.net/upload/files/doxuvo.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/81549934570.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/42616995394.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/fujogevumilivote.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8daf836fa---miwovapuzozaxow.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/65324256013.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613498e3ad38e---53418981000.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/1850520172.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/tabatirirorosujadapanojom.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/sizidifefabefokemal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=visible+light+in+order+of+increasing+frequencyPDF 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_off000134ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CE 11224 bytes
SHA-256: 4e35c2b40d581c43b6cfc805dc142d191b2ace65bcf9b880c497d2660b117b21
font_01_sfnt_off00014e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E90 19460 bytes
SHA-256: 62f6db3674030b0bdfd0ab0abb4c38249405dccb2d1d5ba26dbad4d26f4baf70
font_02_sfnt_off000181b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1