Malicious PDF — malware analysis report

Static analysis result for SHA-256 956ddcf0c4ecdde4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 02:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85f974e246af8e249a272f54fb75dbb0 SHA-1: 739c2d30ebaf5dbfac6fbda3a0c022ff80952838 SHA-256: 956ddcf0c4ecdde465eb4e034c6052a09c35fa6c4524c7559c3a42e815335a39
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm designed to host files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to trick users into downloading a password-protected archive, likely to bypass gateway scanning. No scripts were extracted, but the presence of multiple embedded URLs points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://eurotig.ro/file/7979189598.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1283376a---gajevu.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/23403685493.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/bemikuni.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/96516414885.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/45555146412.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/pukumopuzowepovubami.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wisakasigupu.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kalafonu.pdfIn PDF document text
    • https://harmony.im/userfiles/file/18984791431.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/sonofosogilakikeg.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fotizibil.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/40372837981.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/74898533987.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161326e3406635---tezosanotegud.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/62951299038.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/32066527527.pdfIn PDF document text
    • https://amgaa.org/temp/files/dodimalakubokozagat.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/dafalokavaxapikaro.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/latevamesibuluz.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/fageg.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/mibagiwujaluguwujimupa.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/49209627572.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/jenojawo.pdfIn PDF document text
    • http://househouse.it/userfiles/files/37217357888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+fifa+19+iso+file+for+ppssppPDF 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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 18804 bytes
SHA-256: f55ad80b68ec6a4f33b94dd503c2c91cb23004cb2701f2836b82b0c3155f91fd
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 10700 bytes
SHA-256: 854f0051a94102b470d1895d9104f47bc8c7ad04c25bcdbe5899f82394f85ad2