Malicious PDF — malware analysis report

Static analysis result for SHA-256 81456a984e66201b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 08:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 42b09a219402e49de2bc117bd64008a0 SHA-1: cf51a577f71eb7ab6f10fb190473da8340e7fcbe SHA-256: 81456a984e66201b4935603342bc732bb5df9ac75b81da7f047a750ab8a91217
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs, many of which point to disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the sheer volume and nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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://queure.ru/uplcv?utm_term=sexy+words+starting+with+k PDF link annotation
    • http://pokwuttibut.com/file_media/file_image/file/timazukulibojajamoko.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/53627411092.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/gumeworisasi.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/zibab.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/saduwutogebubu.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/zuzumobajatunepew.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/59234088435.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/81656225558.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091406451487863.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/mizomemilukekur.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/xufud.pdfIn PDF document text
    • http://htwy.com/upload/file/viguwanedu.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210906_002548.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/62892591639.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/92574724191.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090419075932.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/77812660105.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/49456794463.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/5005809361.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/munozinuboti.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/nujawidokasoviwerulagawuf.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/xuzisas.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_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 18564 bytes
SHA-256: eb550c3df3ec2dbbb488a7c9a648f408f05400aa9fc0fa1139588eb722416cc4
font_02_sfnt_off00012d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9C 10952 bytes
SHA-256: 1d1d52fb0e1954b53c044e9bb1c05aa21fc6e510ef6a6511f0e05cd9c8e7ac6d

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