Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d37aa499f4dd8b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 00:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7a9260c246fabfe750f9e2e7c15441f0 SHA-1: 7f3ba1419120bb40c26730b2ab465152536b7b97 SHA-256: 81d37aa499f4dd8b4e35d73ab531b59735c6145de0ec53275fb58b158e044afa
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=episode+mod+apk+2019 PDF link annotation
    • http://massintech.ru/img/outer/files/82163948403.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/1181905824.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613f29c1490fb---75162027051.pdfPDF link annotation
    • http://seattledesis.com/fckeditor/file/87971112495.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/bokit.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/86102258792.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/71929168818.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/sozaj.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/87750109489.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/11205631948.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/geraruxemiviwef.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/zufomarijanunesova.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/99300541469.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/20911145555.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/zikusiwifopijivob.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/fagapuwoj.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/97739145254.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/gumapimowotuwidawijumodad.pdfIn PDF document text
    • http://kite-surf.sk/files/mebib.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/zuboredudanakafip.pdfIn PDF document text
    • http://creationart.hu/files/file/3341694374.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/75851671648.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/38276054573.pdfIn PDF document text
    • http://pneusmarene.it/images/file/batogokunu.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_off0000bb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2B 10744 bytes
SHA-256: 459b999fc74ba9234b526e509688b91da5bee3332e5b853b7da6c9e251b1e824
font_01_sfnt_off0000d3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 15396 bytes
SHA-256: 3821d8d9cf004e429344429023fca85d42dc3b0b97d6c148b27983336c33a0c0
font_02_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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