Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff70d6523ae39073…

MALICIOUS

PDF

74.7 KB Created: 2021-09-23 06:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a54357d3d0a3315602fdf29a75b4298 SHA-1: cd61339d183cf30e88fe268a5ba9b4205d6b8eb6 SHA-256: ff70d6523ae3907317e1c67d529cc9c04904b7ab470d615d776a7e1205ba53bd
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains numerous embedded URLs pointing to a link farm, suggesting an attempt to distribute malicious content or manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest exploitation for client execution, potentially involving embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://jaluzipro.ru/public/userfiles/file/runemazutavodagowalo.pdf In PDF document text
    • http://0932018255.kad.tw/kads/ckfinder/userfiles/files/40734737729.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/voterudelamozupanegusijas.pdfIn PDF document text
    • http://infosierra.es/images/editor/71406957368.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/6599309377.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd02004e93---55376668538.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/81631850259.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/21450955929.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///95536382386.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/27969042273.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161413bd9f057e---85128923463.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210904_8D1D800008726016.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/77423763317.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/sosaxufovepidu.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/pezonilupomewekax.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/26275135346.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/jexurigipometizosav.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/xikuvus.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/73764121227.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/perovadipujejuwepalawejes.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/31956732505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+waste+land+summary+pdfPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/jamifonadufe.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_off0000be85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE85 17624 bytes
SHA-256: 03e2b23aa1e41a2962f8841a6d1763a1157ff5e8086138b463ad9bbbae18b5f8
font_01_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 10816 bytes
SHA-256: f02f20b24463f62870a616da4673be70de311a9a1ccc5bf1f12ecca3c3741c55
font_02_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1