Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8e14ffe1231541…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 17:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4834999b73bd17e5657d8186c908e696 SHA-1: 0b4c952ebc9c61c363b0cadd083f8f3b73815564 SHA-256: 5a8e14ffe1231541181558c801389f2c8968cccffe9942ea1879eddb181091af
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 https://nomylo.ru/uplcv?utm_term=watch+one+day+at+a+time+online+free PDF link annotation
    • https://anjingliar2.com/contents/files/44632474248.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/bosivonalilomitilukap.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/lopuvidakeferasaroxade.pdfIn PDF document text
    • http://geraldinekilkelly.ie/zazop.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/7250770578.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/4264255926.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/pawoti.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3724267375c07f2b5b1ee23ca4f47c73/nafurewuvupuvu.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/85374905096.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/48708610951.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/sowusuvizagevasedun.pdfIn PDF document text
    • http://dongphat.net/upload/files/nupelejuf.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/suwolawonekudozowexonada.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/55663647492.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/72060444649.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/88968815731.pdfIn PDF document text
    • http://air-con.ru/upload/files/69429714246.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/57138453587.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/fifopusamuxupukarozuje.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/7263392672.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613958fe880bc---safat.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a7848d8ce72ad92c4b4851b1c3578ffb/89928455292.pdfIn PDF document text
    • https://titishop.co/upload/files/mamunawir.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_off0000d01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01F 17208 bytes
SHA-256: b304aebc320942ee95afbfa73a1352a239c3b68685375a8a1156f673e94f7627
font_01_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 10680 bytes
SHA-256: 02dc157db253412f6a2bcf639759a189148e9e8eb91fdee75525955941791b34