Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eef56a97e0aae1c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-14 07:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f56509bff0f7e5eb0436392062f52554 SHA-1: ebbcf3cc0d81e145c32dd340b222eea5bf4b4895 SHA-256: 3eef56a97e0aae1ccf8818c76d5d7a34bc78814767ad8b3929ad7cbdbbac285e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially malicious or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bunexim.dascalita.ro/app/webroot/files/userfiles/files/vajade.pdf In PDF document text
    • https://themalc.org/files/file/jofezifedigimiwu.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/figejiwu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff487c2538---40334981400.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/xesedenomijere.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/36301078298.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/raxawanagopokixu.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/bikojakujarazisumoxiza.pdfIn PDF document text
    • http://artediapharma.com/upload/files/45687826764.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/jixibedenorizu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/silujovilituta.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/31612697549.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/34941219386.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/wixosata.pdfIn PDF document text
    • http://modero.vn/upload/files/denaguraniji.pdfIn PDF document text
    • http://feg.vn/uploads/files/11376259886.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/juleke.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/28977735626.pdfIn PDF document text
    • http://chpcentre.com/files/file/gimonotogaladixibu.pdfIn PDF document text
    • http://15881588.com/ckupload/files/74571456478.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/foporuvo.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/35311089916.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/10046572848.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mh2kvm713sn2qem7fldacg8ja2/87365922114.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/84590415269.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/22842456129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+sa+online+androidPDF 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_off0000b5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D2 10280 bytes
SHA-256: 2786891f647013a77ef1cf5c4a85c9b1f1bd09fb02883fd1383fdc162ec8ac97
font_01_sfnt_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 15936 bytes
SHA-256: b26385af0f12f96cde1ceb6ba182383bac59e5fadb7fc4c409ecd3c3d8b12b2e
font_02_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1