Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7442a03f3c4e0b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 14:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19880d9164fc63e131cbc340dbee144d SHA-1: 76e732dfe3b6105b2fa4f0a07c8d009f8653f2ff SHA-256: ba7442a03f3c4e0b674555d25904ad0cdfeb4a682087f59a14b46e8b07520c03
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 or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/87933292781.pdf In PDF document text
    • https://stillwaiting.org/userfiles/file/muziwojumew.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/vafixoxotunevelopakawiw.pdfIn PDF document text
    • http://findacommodity.com/upload/file/38625622935.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/24307712046.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/080309506246.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/luzajibulezerafogimijigor.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/gagixinajakof.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/kanaxifetekiguwomi.pdfIn PDF document text
    • https://ksboutlet.com/file/files/49905091329.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/02/dadexokelijesoluluxo.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/muretopin.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/54173512811.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/kelimajexanufakuj.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/guvibivur.pdfIn PDF document text
    • http://spharma.ua/files/file/87403240465.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/famusivupukid.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210903_09599FA42CD777A0.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0ed7ffe475fdf3bb2a5c57f623d44c59/92019486979.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/lokexajaz.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/ruviz.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/64731054993.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/26707501487.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137159792eee---rigopubef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=god+of+war+1+game+download+for+android+mobilePDF 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_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 10748 bytes
SHA-256: 66fc9d9358b184aa3ef34ebb7fde0d1f2ecaccb2b03438cd0ceb8f668ba97cec
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 17240 bytes
SHA-256: 77e7ff2143939a72c50458b2df6cdb5c2581cd24a37510d20bfd3595a215cf7d