Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17dd867ef475564…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 10:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4618866f9ab2c404c797b3a8698b62b SHA-1: c1bda921bb89abdf3715d92e386825e27ff63459 SHA-256: a17dd867ef475564daa59ace727498a8fb5fee27887d266a96e46c4780bb84a8
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. No scripts were extracted, but the presence of numerous external URIs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://ketchas.ru/uplcv?utm_term=gas+turbine+theory+cohen PDF link annotation
    • http://dtmaso.com/public_html/Imagens/file/69801827602.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/13536010982.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631601734.pdfIn PDF document text
    • https://phuquiland.com/upload/files/naleme.pdfIn PDF document text
    • http://bckvalumni.org/userfiles/file/zodaru.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/kitowiloxil.pdfIn PDF document text
    • http://espokebar.com/uploads/files/53755874167.pdfIn PDF document text
    • https://12shio1.com/contents/files/xunavesirirorivisusoderer.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/56422117153.pdfIn PDF document text
    • http://seamacros.com/upload/file/puxemojediwagujogefufepap.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/kaxagolekavi.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/kilororoke.pdfIn PDF document text
    • https://edarky.net/data/file/detigelonidenuvalo.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/33850518491.pdfIn PDF document text
    • http://shesob.com/file/files/51062720261.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20211001143732.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/88395222317.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109040718239367.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef2c22aa80---vilubodurexu.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/28314238408.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/rakakuxowot.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/vununudofobawotip.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/12002929684.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/39039410905.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/vugujekiwavogonajumelexa.pdfIn PDF document text
    • https://domilot.com/uploader/files/90475021460.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/xewud.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/86931722143.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_off0000b219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB219 15076 bytes
SHA-256: 35a0cd443c14a6a32613968869c1b2c6c7eca8624db2905c189ebd5a938939b6
font_01_sfnt_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 10676 bytes
SHA-256: f1fbdc70ee397795c194bb3c6d2fe3b0c90576a3fd37ded61caa91b6af6a3c86
font_02_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1