Malicious PDF — malware analysis report

Static analysis result for SHA-256 708ced4dab89f9e9…

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 13:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 333fec78c5c341dcbc53f29c425e1e60 SHA-1: 0e6560bd6c14d106e36c50412815748d30c93e07 SHA-256: 708ced4dab89f9e9e1d2ca936bdcac26687f2531cd129635866de36423428e10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee1b1bd24---fuwusub.pdf In PDF document text
    • http://bronia.org/userfiles/file/tinuzubuzozojuvodawa.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/37583461785.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/jupew.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/sefozusijote.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/56095457136.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///22262565019.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/mamekot.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/fumunedipage.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/xibiraxipasatinev.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/zedaz.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/fobuzomodatilamub.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/4306139148.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/86627876166.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/bozuxefezigakimiz.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/tuzijabojezizipoxufujage.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/30751026408.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/68751098169.pdfIn PDF document text
    • https://iwistw.com/upload/files/midukuxiwin.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/28910804255.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/16579364344.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/zuzezak.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630615371.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/17897706269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hairstyles+to+make+face+smallerPDF 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_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 18784 bytes
SHA-256: 1b5c8c4fb4b71dcf2f64d6712d0892100a391acb25efa4060964378132853254
font_02_sfnt_off00013c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C94 10592 bytes
SHA-256: b99dbd4911c57ee786d0aa7ef9d7d5b3278194444f0e02f54324a255fc5fdc54