Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c219e9aa7439841…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 22:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3130768cee85708dbf2ae2976bbe3a54 SHA-1: 217830307f152b7c0d6cc65fef9bd72e2fd83298 SHA-256: 8c219e9aa7439841fa05344f2e7ca470da12bdafe0435134bf1cb2fbdba84a39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to potentially harmful content. The presence of external URI links and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://allytemp.ru/uplcv?utm_term=descargar+billar+para+android PDF link annotation
    • http://fashionflutters.com/ckfinder/userfiles/files/18268957138.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/zitelopemorenorupoku.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/25494138028.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/wutodilikuvojekami.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/77342214195.pdfIn PDF document text
    • http://donghotam.com/luutru/files/2636084115.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/11049673525.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/99105578464.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/pazosumutabefuwogiko.pdfIn PDF document text
    • http://zenithmetals.com/files/60997663490.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/wunozikobapejibetidis.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613212aa988ed---64139147401.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fikuvesegikolisunowe.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da36d51d9---13717588359.pdfIn PDF document text
    • http://precisao.org/files/files/pafiza.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/faxunuwujatarusiluxilel.pdfIn PDF document text
    • http://abpaluso.com/upload/file/taxebinemajigopilefomapo.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/95538065355.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/89432875947.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/kibavekagi.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/bokemejolaf.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/matera.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/bofafinuvukejepaf.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/godarivasafojugaropozudog.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/63607280985.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/10310323969.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_off0000c2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CB 16640 bytes
SHA-256: 652edb5e9445d865c84e2682da14d367ebffade847b3ae157f1e369610789bc7
font_01_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 10732 bytes
SHA-256: 905e7040cc8df996679a9c49ea0cf1d59c105e80f9d743e1c14cd4f3403402d9
font_02_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1