Malicious PDF — malware analysis report

Static analysis result for SHA-256 70eba18d704e539d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 02:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b85d206c76066fc87868a899ddfc577 SHA-1: 51e6c98713a9a7129dc55351671887716910bdaa SHA-256: 70eba18d704e539de663994f64e0b7c9aae70fe4cd4565e3c8fe2ae427b12181
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of external links, many pointing to disposable domains, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/27086206361.pdf In PDF document text
    • https://blokhol.com/upload/files/taturomavuziwim.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/fomoxugopufofisatafab.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/nesokoxo.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/16746819201.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/wusilidabirogi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161450e66d38bc---64586164898.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/34062020904.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/67652655474.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/24520000462.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/molilobevasawaximipaxe.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/56024343969.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/jorovujata.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/76072279320.pdfIn PDF document text
    • http://hzqzg.com/d/files/10436061727.pdfIn PDF document text
    • http://newshop.jp/archive/file/vipiwufobidokoliwawuzoma.pdfIn PDF document text
    • https://cardolf.ro/files/83190345466.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/bifodazuwebirisufap.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pavenikasatitatidixixogev.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fvni7iqpum98danir8q7m698j1/tunozuvusotevoko.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109090105262362.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/61566853983.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/25323672589.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/kuzodumivirenufomasit.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/xazawemiroxezazoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=moto+g7+update+problemsPDF 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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 18120 bytes
SHA-256: 6ab8b0349bccae2170a8666b12ae78001ff77c49dc9f96e9193c0c2a01d264d9
font_01_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 10820 bytes
SHA-256: 1e27152b291d5f2c408fccbb5051e2911f9d5a409b00dc719b81b2b63a1227c3