Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d3b1fcc1b933bd…

MALICIOUS

PDF

92.5 KB Created: 2021-09-12 20:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a3782dd2f4e63eedbda284cbc28c5fb SHA-1: 21b6e033d6b195563e012208ee7e756d39748dc3 SHA-256: 85d3b1fcc1b933bd096d0d55de95ad086b4f3d1b41e48dd69fd39c679894a31f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=kissing+booth+1+full+movie+online PDF link annotation
    • http://thucphamchucnangmy.vn/uploads/files/nibudenerajapikug.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/letowarakarigaxupunupasuj.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/26262027668.pdfIn PDF document text
    • http://baove24h.org/upload/files/82744991182.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/zofitudenugavolunilasovit.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/50682524490.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/90184598032.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/76863513522.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a7870747---22166448833.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/33555223327.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/47428371850.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/75650114732.pdfIn PDF document text
    • https://kawanmto.net/contents/files/vapebitejowakat.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/oadfrbf99i7fali1l4jjnvslj7/40554480657.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/tevotowinub.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/21601731051.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/05/28656640861.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/26470374296.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/9996635041.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/tekapuzijamafokaxevejava.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/rozexijewoboset.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/21895108593.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/1900450839.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/gumokerukilazitonex.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_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 19900 bytes
SHA-256: a16488f56de52f785f6ff33620749536a1880f21836d45ab8e09fada67004b99
font_02_sfnt_off00014bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB4 10748 bytes
SHA-256: c2fb344ea0fd0de81832d3ede86ce1e671df5583664d105fecef330b4ad52fd5

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