Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b4e39faf4f76a4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 00:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b4422eb1ee1826d32a11db34af2589e1 SHA-1: ccf5438622acdc5e7e5c38c2dc00b4a11703fa68 SHA-256: 08b4e39faf4f76a457ecf21d9a7c121f98c15728d260777dab7126f2a78a7980
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d27d51ffcb81baaffb771be15cf28e34/10072498471.pdf In PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/pokonasenaduwamuram.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/4009266265.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/fevaboronoxulut.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/mexikuwejofefunoxesugar.pdfIn PDF document text
    • https://ismart99.net/upload/files/57841875125.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/leviwede.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/bipexiwujajoziribagobosak.pdfIn PDF document text
    • http://getem.pl/files/file/mavugex.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/gozibipalidobazow.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/89379484665.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/39049532231.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/ruvamonuvirojizuzufe.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/nulula.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/3993380603.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210904071537.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/7843588186.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/932017471.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/xezamakosufunigap.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/6211326337.pdfIn PDF document text
    • https://superpart.com/files/kogakuzibopabimijimu.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/840469439.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/soperedomuvap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=print+2+pdfPDF 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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 18272 bytes
SHA-256: e2ddfd7179146d414153e592b49357e6073919186f40bf4361677a2f8129cfb2
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 9984 bytes
SHA-256: aa9fb60249b9e19103c8ec49759969d5003b34a2cdd6f20317b794b50170663c
font_02_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1