Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8cf31f31932824…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 06:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8245a7343d65eb3b32bb8c8be0a3b614 SHA-1: e3eaf098b1aae0105208238688f92cef2882d1b2 SHA-256: bd8cf31f319328241c4ae08acafb29dcad6a132fc3dd80aac29443c17fecb2a5
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as suspicious or unknown. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mgs-on-track.com/uploads/misc/files/memitiripu.pdf In PDF document text
    • http://applecentervn.com/uploads/image/files/xedofo.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/16506409419.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/64908571557.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/nekazer.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/gikaxagapifevudim.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/vogejunom.pdfIn PDF document text
    • https://raljob.com/userfiles/file/tupugomufodolakogiwowofu.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/juribazejivulot.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/88515142907.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/35791575657.pdfIn PDF document text
    • https://clinicscrm.com/img/files/69591610117.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/rewigulabit.pdfIn PDF document text
    • https://masukpt1.com/contents/files/moneguwir.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/95770420631.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab063b20f7---88331954363.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/fubesekojone.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/59433260248.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/39114401234.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/88610746214.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/84933335091.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/427d2b2f88986cffd3d649f86a488631/bovano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=safe+ringtone+app+androidPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/33308789314.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_off0000ad74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 15132 bytes
SHA-256: 3ba1de18b3a96f72a83ece779ef604b28d41db0d93978590ded5f7630d1e9f9c
font_02_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 10536 bytes
SHA-256: 4c5534e1377bb68b843df0bbd26573d95076292b7aeab06292f5c42e24744ede

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