Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf58eb09f582cba…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 12:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c10c36278a5eb5fc981d41869989961e SHA-1: dcced304101f2bb8049f709fd24372c6bdaf1852 SHA-256: cdf58eb09f582cba2d4ccb6f1aacba346fb044a34159401e39f657fe5ddddbdd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of external links, suggesting an attempt to redirect users to potentially harmful sites. The presence of embedded JavaScript (T1059.007) and the overall nature of the file strongly suggest it's delivered as a malicious attachment (T1566.001).

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://consultemergingmarkets.cubsindia.com/files/41712125642.pdf In PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/11402641336.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/ruton.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/52988503597.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/55018314840.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/banopugi.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/gigakijenema.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/69037866813.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/47203096130.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210911163458.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/1992435631.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f31b5e91a8---beguzowipelesagogiwipu.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/73931371632.pdfIn PDF document text
    • https://nasikampung.info/contents/files/31705396607.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/xuwaloduliwevozigiwosifo.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/zagefoj.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/29792912401.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/ligodibi.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/rubutujitijexaxawodusoxa.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210909_013354.pdfIn PDF document text
    • http://origo.ws/userfiles/file/pufatizijakikinuga.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906235227.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/tudid.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a295e9b9d---87781482932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=o+come+all+ye+faithful+piano+sheet+musicPDF 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_off0000c097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC097 10884 bytes
SHA-256: a051c39b0ddd436b7918a400c6e1483da4b7478d1ec8d4057fa9d4a4239effe5
font_01_sfnt_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 17100 bytes
SHA-256: 36dc213640813c3f07e61f6676b34d29bba371e3241e5c64f377449584c15ce9
font_02_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1