Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1b786790f57e1b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 00:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bab01f51702eff9822e5151f74faa34a SHA-1: 1cc3fa7b2a5bc44e8b6f243faf3a1c0df5a480e8 SHA-256: ce1b786790f57e1b5a96622605431e91743dbe4d1337df7641629f7e0268d302
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to host PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a malicious intent to distribute or host malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=how+to+write+address+on+a+courier PDF link annotation
    • http://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/35935755116.pdfIn PDF document text
    • http://erictex.com/ufiles/files/zukerobipaluremekewuso.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/fiwaxure.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/larogagexomejafakuw.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/49633692139.pdfIn PDF document text
    • https://hoalavender.net/upload/files/tonopojivil.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/mozud.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55dd1b4f0---93131730090.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/48049408084.pdfIn PDF document text
    • http://pneusmarene.it/images/file/lumosesep.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/20471455128.pdfIn PDF document text
    • http://dsfly.com/uploads/files/pefaxifadakegexumofelenek.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/lovamamowuwamepigama.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/nonuged.pdfIn PDF document text
    • http://normel.org/files/upload/file/1455826427.pdfIn PDF document text
    • http://sung1.com/upload/files/95492665497.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/sidiwabesalazufa.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/zivozoxag.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/87473599431.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/82814545380.pdfIn PDF document text
    • http://workontext.ru/media/file/dewamite.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/14531814218.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/xupujelaf.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/87127294157.pdfIn PDF document text
    • https://buyafranchise.org/files/files/rukaluvelutog.pdfIn PDF document text
    • 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_off0000c032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 16396 bytes
SHA-256: 7a5c4b09744e19725d79d34d525b31165cb40d3ae02a687d3809ad0cbbde7a25
font_02_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 10492 bytes
SHA-256: d923a1c9a9aa67c95408a92510ca6e7572e3247e250a84df1a5d47c69feafb3f

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