Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6520a9727072bc0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 16:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5f1ff83b2c5b497c5899f4c356041fd SHA-1: 0423ff7f574f452f4b948a43fb96411e89c9e61e SHA-256: d6520a9727072bc0920095cfc7d52579bac1f1e23f9c2bb5d3ac306bce3e719d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with many pointing to potentially compromised or malicious domains, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is used to farm links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://harmony-lazienka.pl/Upload/file/82252517151.pdf In PDF document text
    • https://halkum.rs/files/zilaf.pdfIn PDF document text
    • https://pecintajp.com/contents/files/vanosuxuga.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/3327680877.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134452384f29---27889076815.pdfIn PDF document text
    • https://cian.hr/userfiles/file/memejebaramazik.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/62150006683.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/315072556.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/tokavawes.pdfIn PDF document text
    • http://teledirk.com/d/files/26511171910.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/tajexatarudugape.pdfIn PDF document text
    • https://ratosatu.com/contents/files/xaleweroveluz.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/1902741073.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/xolefimujezuwapeko.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/44878115546.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/wopowote.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/64731054993.pdfIn PDF document text
    • http://m2m2design.com/userfiles/26496158713.pdfIn PDF document text
    • https://eventaipei.com/upload/files/86859764398.pdfIn PDF document text
    • https://tdfstore.it/file/tuvugibewul.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/98186465348.pdfIn PDF document text
    • http://tyextractor.com/d/files/11235062959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=is+113+a+composite+numberPDF 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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 10904 bytes
SHA-256: d3ed33fba3d341f01d9deb9563739d73aea1cd82678ab5c5e6bae282b8de07ec
font_02_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 19436 bytes
SHA-256: cf72ce8e7cc07a706cbbc5d67e9acb5df217b7f24bd08aff73273d3a18c5dde2

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