Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4b516506afc3b3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 05:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 606684c5109c7d9bc986c64381210ab3 SHA-1: 8dcc5c29b29eecbfbed5d2f042fb786a0e8d0243 SHA-256: 3e4b516506afc3b3c0de9962c0fe352c81ee300952d42e8b07013b33b04564f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the nature of the PDF and the embedded links indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=how+to+sell+cars+in+nitro+nation PDF link annotation
    • https://rotterdampools.com/contents/files/41752985249.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/97705679283.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-04-10-50-40-50.pdfIn PDF document text
    • https://sanagustin.cl/files/ridupoxavukutam.pdfIn PDF document text
    • http://ruihuitax.com/files/file/dusadupepepuzewubukuxi.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/fisazefomozun.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/fizajavo.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/zupejexurimobidufofas.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/wanofabavilodap.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/71954922011.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/44263898404.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/2179460863.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/30715448241.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090710155780554.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/kawagopejibutusaravevegow.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090204492712.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/21751305747.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/64360315834.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/safefusin.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89c55123e---lilubumatopalebowabi.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jusumiwozalased.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/97274930433.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/xepowiwimizufevamazodusi.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_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 16856 bytes
SHA-256: 450ad695b4dfbe58181b7915f52c67584167695e00af39e859eb613c2cf430e4
font_01_sfnt_off00011529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D40 10300 bytes
SHA-256: 7f98d9ff7b176742901355936c1ecca055ed9e33ebdb2de9d6dd2a33dd2dd205