Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ca007a31bd95bc…

MALICIOUS

PDF

72.8 KB Created: 2021-09-22 20:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2350570e6f7d73d2be55d655d0a09ed7 SHA-1: 19dbc24aa7d3e5ed72350900b3bf40e5bfd0d547 SHA-256: 12ca007a31bd95bcf215aaded68a0536ce13250aec95e830c6263327683dc816
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://t-eamplus.de/web/editor/files/15215242542.pdf In PDF document text
    • http://itps-group.com/uploadfiles/file/jidavaledoku.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/walub.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/qai56ovpj1rk5sf669h7q2pj8b/27506928233.pdfIn PDF document text
    • https://31app.com/userfiles/file/37784953980.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/sapafikimenalibuwobe.pdfIn PDF document text
    • https://primer-spb.ru/files/files/45296569664.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/wirotifez.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/duvubovalukowolif.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/rebavov.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/varoteduv.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1632173152.pdfIn PDF document text
    • http://yuli-china.ru/d/files/59508571823.pdfIn PDF document text
    • http://secretinvitation.net/images/files/18945003127.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/xepijusetazizidili.pdfIn PDF document text
    • http://nhakhoanhantin.com/media/ftp/file/23160420430.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/10909035915.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/48766819444.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9572aa72---punox.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/45210759307.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/binopimineniwegaga.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/57863771913.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/jomizasenasoref.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/fusovonifedif.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/wogudonabifujale.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/51165587682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+fortnite+skins+chapter+2+season+5PDF 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_off0000bbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 10856 bytes
SHA-256: aee6cacee7809e6a5e47743418e3fdf6e5ee6ec420288b374e9ddc3bc2db85d4
font_02_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 15704 bytes
SHA-256: 29b1575ebce734f58967b867ba605853bac4a454f37491851528d83ba5d9c9f9