Malicious PDF — malware analysis report

Static analysis result for SHA-256 05564ffdbf78e805…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 09:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a5f4516de9e764df405025cb79aa4c7 SHA-1: 1dd52278921042484d3f78cc60831c9907410f0c SHA-256: 05564ffdbf78e80598e8bea533f6353969c54bf867d83b9e89e64e55f3d9be57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to numerous other PDF files hosted on various domains. This behavior is often associated with SEO spam or as a distribution mechanism for further malware. No scripts were extracted, and the document body was unreadable, limiting the ability to determine the exact payload or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cardolf.ro/files/9340577602.pdf In PDF document text
    • https://audreyheselmans.com/_files/file/dojironojikofegovi.pdfIn PDF document text
    • http://fkhd.cz/data/img/vusef.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/32791397871.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/85040690044.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/zojikix.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/saneriwitulazi.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/75152893734.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/26348496738.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/64910126613.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/20641722764.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/nifipofebosi.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/favobalexowufozonimegelo.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/nawejipa.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cb9e452a---40407368397.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/livorim.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/kixamexisezebuz.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/pobenebuw.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/kaxelubupi.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/bibekowujevuzani.pdfIn PDF document text
    • http://videocycling.info/files/file/zamefu.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/boripanugij.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/kuzax.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/82849611943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=50+shades+of+grey+book+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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 18692 bytes
SHA-256: 3ff9a741ed18ab122f63e9737ecafdc0eceb7847459f1deaae298438ea214be7
font_01_sfnt_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 10940 bytes
SHA-256: 61c1a476a1bb1257f6e3931de7880d0f82a9516fef8b127cdd1395a087cb7f43
font_02_sfnt_off000123d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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