Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae160749203ee531…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 11:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6086a66f0962de1fc94aad3454cf9ea4 SHA-1: e8e6f668a9f65e29aa22694f2bd9496ee33c60e8 SHA-256: ae160749203ee5311b4d43b9f94d42152ae686dc8994df81be5b9d8e82dbc8f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files on disposable or unknown hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of creating numerous links to obscure or hide malicious content. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecd108e78---kufalufaxuvixubonomifim.pdf In PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/bunarolufebemejafatowit.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/28235725358.pdfIn PDF document text
    • http://www.centralperdana.com/file/jigafiwawoxifitomasolalom.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/83345877071.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/65661466136.pdfIn PDF document text
    • http://sungder.com/upload/72988690978.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/dixisojunug.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/vekumori.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/liwabegopub.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/8835190092.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/72609043969.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/97516539431.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/mabibazadasoxumilisafimi.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-10/20210910221141661453.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/vogales.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/29349817324.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/selapotiseb.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109022129276579.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/kobilujekilapigatunevuro.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210904220035.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/towegojonineli.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jinokipor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=filmyzilla+hollywood+moviePDF 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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 18492 bytes
SHA-256: 83bd3a12c944a48302225bf610c57010788450efe893fde7f5b2af47b1c57730
font_01_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 10344 bytes
SHA-256: dbb084f879c85a8fdd64919f9f05e0f6c299be56cad644f6c0d261263e25dd51
font_02_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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