Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84f8ad8f79cfeb9…

MALICIOUS

PDF

88.8 KB Created: 2021-09-09 11:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 104e04064eb80493d06130292170ec40 SHA-1: 752720b14a933e0244eacfdb4591939d6a443963 SHA-256: a84f8ad8f79cfeb9112aef307d54c3e7b11673c6c96e20cd83ed842f06408558
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://td-mg.ru/uploads/files/87261056867.pdf In PDF document text
    • https://hotararicedo.ro/files/files/3194503803.pdfIn PDF document text
    • http://qwerty.pl/_data/file/65554932374.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/viteguginanopuwusoko.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63099346045.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/31952393227.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/85240822167.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/19909701504.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133f6b6b9098---34738353294.pdfIn PDF document text
    • http://tulga.ru/editor/files/95687182636.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/wopewivugofexi.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/21878103626.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/53132482575.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/54410055815.pdfIn PDF document text
    • http://reopen911.info/media/file/67427801544.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/nipaxomivovozatosuguliren.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/kobipegusurudegopidux.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/zadexufoliguxugewuxobo.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/muruwazofukakeniwadinos.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/fajujidifevufalobalupo.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/xoxufuru.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/wejet.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/lugupapawa.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tebamivugoleva.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/sefufawesefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=clash+of+deity+hackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 10608 bytes
SHA-256: a0a2c7d7980608a671e0490aa2e6c9b07c075c8c00a9824deb9e77dd981ba4c7
font_02_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 22848 bytes
SHA-256: a03f68e3b5663d6ba63c46d6fa1129424b2a0e10d2b5cb574f5267a83bc6eaa2
font_03_sfnt_off00013dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC1 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137