Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d61697a877d138…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 12:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d581073e774c474c4eed81e98b259bb7 SHA-1: d5bc1fbfebe169864f6e08eff5514b3f4cc80460 SHA-256: e7d61697a877d138b834a88cb2b86e976e1cea55bf9308af084c4703c7b74893
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest an attempt to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://shengnabei.com/uploadfile/file///2021091309210959.pdf In PDF document text
    • https://resulgame.com/calisma2/files/uploads/3239473066.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/sogopuvukizojokovo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421db4c4aa7---15358032081.pdfIn PDF document text
    • https://bfull.ru/uploads/files/81744774517.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/tezoso.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/58830956434.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210901192903.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/39800015653.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/lajinusoweruwogibuxumad.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/bobet.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/zofaze.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/fadiweki.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/24739637992.pdfIn PDF document text
    • https://defi128.com/userfiles/files/32646624871.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/saradapogenetofubazatowu.pdfIn PDF document text
    • http://htwy.com/upload/file/86066950118.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/joxuroguvudagumofexi.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/sovib.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/ramaw.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/bowojisesoveborataledar.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/75345555481.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/20881629059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bloxburg+house+on+a+hillPDF 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_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 18080 bytes
SHA-256: dc86569ed1ea90fbaedcae5f64e1050526b6f67ea9bdfea7657ba698ae95fbf3
font_01_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 10684 bytes
SHA-256: cb74743e960021b6bba5da67ea6104906d7a452ba2aec81242fe53fba5a37769

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