Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa9b996345e0346…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 13:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ba3a151dda6cb62aa3e5fdafc545f233 SHA-1: 7b7ea3ff26e3c7d3a22e5d0677148b036c1095d0 SHA-256: 4fa9b996345e034689f97a7ba44864b07aa2948afb7dd166fc3c74cbc7c1ddea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://archism.ru/uplcv?utm_term=watch+legend+of+korra+putlocker PDF link annotation
    • http://salon-urody-bellis.pl/images/file/rusox.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/dojijuzonomadonumosozivu.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/fibanegufasagur.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/36740205225.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/28277988791.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/71478163454.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/11009650288.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/12530066616143413e6ba55.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/pilex.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/19146027018.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/palotoruzusuxulikemex.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/22616819644.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/48186622677.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/pifenorajeranepowafesolu.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/85645786864.pdfIn PDF document text
    • https://ottopianos.nl/files/rujemiwotis.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/wumarobaxedixudatogu.pdfIn PDF document text
    • http://altus.pl/userfiles/file/33726515384.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/kojokurewoxebugiperikovi.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/susutefa.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/divadipi.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/53925785648.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/xumudifoz.pdfIn PDF document text
    • http://beaszemin.com/files/morexanonataxobozotuvowa.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/zefafasorubowogitivupuwo.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_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 10824 bytes
SHA-256: 4022fd4ebe1608e433d6f3c382c0fd671b47b91a3a4a316416d200762fca52ef
font_01_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 18832 bytes
SHA-256: 1f197053377a431274fc5d991265590bf098d9038c68652553552bd288acb26f
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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