Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0b33340fc7d914…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 23:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17caf31f80fbd275fe139c3507452fea SHA-1: 2a89fb01cb8d67e76e76d5f35a36394d5417e9c0 SHA-256: dc0b33340fc7d91447b8bf23422e168930bdfbbb97e87f6ed05422ed4af07f96
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=movie+maker+2.6+free+download PDF link annotation
    • http://ncfc.com.tr/ckfinder/userfiles/files/19736516588.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/89680683951.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/386522860.pdfIn PDF document text
    • https://subded.org/userfiles/file/33322773736.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/dafesewulonozewisi.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/maxupid.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/19432381967.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/25016140555.pdfIn PDF document text
    • http://lawngo.net/fckfiles/26221695625.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/29595456353.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/52551581837.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/pulapajuruwegagigepuw.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/77365121791.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/46905803488.pdfIn PDF document text
    • https://ewt.cz/res/file/tudokokipisejepusuvakixi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde1acb758---boraruvutawutulozevada.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/lo5q9ej496q83q3clm9r86420m/43650211142.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/84064943421.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/kujuxifulokifunekuluk.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zowaxusatejaluwariwi.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/77572283649.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/veragafejesubir.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/96203726984.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/rudosorizer.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/dexoretajebexulunopaboge.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/50822959273.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/tuzokonelari.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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 10840 bytes
SHA-256: 3ad85af94ccebffe48f978788258eb42b2134195b54189973b61b0593eabfba4
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 17544 bytes
SHA-256: 4275ad87895c96268e42ffc9e18fcc52198fc746dff905f38b36f3dcc4fa0d5b

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