Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b55f6038e0cafe2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 00:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c04133551182b787b7875398daf5df0 SHA-1: 891ac501fb3f44343760368530fb5cb4cac35086 SHA-256: 9b55f6038e0cafe202abbbfd9e61c3c03e0e66a8c2f07ca7b581c8e2971bedd2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of many external URIs and the link farm structure indicate an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://deltarealestate-eg.com/userfiles/file/muxaluwenipanujolubad.pdf In PDF document text
    • https://pacantioquia.org/aym_image/files/59224635823.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/zoxibogosow.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/mirifajezanor.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210906061907.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/golufebevofas.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/89947001372.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/88055447618.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/53661725232.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/37738315657.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/pidexiva.pdfIn PDF document text
    • https://trieurodata.ro/images/file/simulerixumamoperumedodo.pdfIn PDF document text
    • https://mackbeks.com/files/file/16759532059.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/sawejujowotexi.pdfIn PDF document text
    • http://consade.com/userfiles/file/nevisiterozavu.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/16975804330.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/43073424394.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161346321e1c7a---43964234610.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/40174448385.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/pazatadigobusutoximif.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/47994545295.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/dabuxedudurudekafijevoje.pdfIn PDF document text
    • http://cbstav.cz/file/gijogasoxani.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/77089500630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bin+in+my+phonePDF 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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 17892 bytes
SHA-256: 9c393fdbba5ffdcb052a70ddd0a64f91da0fa2e3563a599207a482cd2bd8c5c3
font_01_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 10108 bytes
SHA-256: b88ea15b696dcbd038969cb2a340fa74a6530e7d612d8685f70d85bf768177e3
font_02_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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