Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd5e0817a7c424b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-20 08:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 33046296be47260ff0ccc80c9a0813ae SHA-1: 97d81515918139c0abcca2f0bd229b63fce94942 SHA-256: ccd5e0817a7c424be75e3e0d5d84304f247740bd3d17e061406c6d2a43d4a51b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The file also acts as a link farm, redirecting to numerous external URLs, likely for phishing or malware distribution, with one URL specifically containing a suspicious query parameter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://medvor.ru/uplcv?utm_term=english+file+elementary+third+edition+student%27s+book+answer+key PDF link annotation
    • http://concilianavarra.com/userfiles/files/zonezovuvuravonokub.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/30344448626.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/nuramerexonuzi.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/92675545952.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/22862354222.pdfIn PDF document text
    • http://apple888.vn/luutru/files/pokojorugazemibu.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/jonebigitagupalap.pdfIn PDF document text
    • http://askaudit.ru/price/36476481402.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/romizutogiliw.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/48717383204.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/79979408216.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/4425088078.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/gobekinivabizuvapigose.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/52224405988.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/61129820269.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/84788612263.pdfIn PDF document text
    • http://lachina.cn/upload/file/xujuporogepegusubu.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luxesesabibumup.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/26813491973.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lm1b4990p71ukmaf4neotkc9k6/narelip.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16139864129122---9329295583.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/22655573732.pdfIn PDF document text
    • http://saktigroup.in/uploads/21833578390.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/gepodavagofusevutas.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_off0000c3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 11348 bytes
SHA-256: e79b31609e58c1602acd8e979e3ae2d56deac1f58118e2939073dbd84a0a2d9b
font_02_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 16744 bytes
SHA-256: 3cf9dba9ce63f2f3257adca0f981f3e0bfe4f0e0e3d97f28fffb169794544718