Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2712e153b4f6cd9…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 10:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f0da1b769483b8b6792285907e2faab SHA-1: a4b260842837056228a910360e7c12eb29f1b437 SHA-256: a2712e153b4f6cd943ce35e37a5538961ee48e361c4ae4cde3c1b77ddb66a52f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within PDF documents. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or redirection mechanism intended to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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.
  • 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://paulabenveniste.com/UserFiles/file/wumuxijozimeporumaxi.pdf In PDF document text
    • https://bdata.vn/upload/files/38206819584.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/bowakajovesilerizeb.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cbf118a5d---53324753175.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/banozudi.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/4560586343.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/mivefekiborabop.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/97604562997.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/gurinawefofudivis.pdfIn PDF document text
    • https://sd-olimp.hr/files/dirilevaxovageso.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fuvupigegupano.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/fukazubiruxaxogem.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/83981331132.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/45270163679.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/51715529500.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/38024144340.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/9103860625.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/gevokidalegopaxisumejo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee181b6e3---66528308162.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/wimoxikeravom.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/kilovon.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/50594656917.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/41989021053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pixel+car+racer+moddedPDF link annotation
    • 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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0A 15768 bytes
SHA-256: d49dcc0b4b92e002008d2ac265adb921bb40ad267bef194aa9fe7eb832fe1045
font_02_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10264 bytes
SHA-256: 9cfb00a732b105ef1765565b59aea8068b1369e71fd072a9f7f58af7498dfc2e

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