Malicious PDF — malware analysis report

Static analysis result for SHA-256 911e6b7ea6d3eb31…

MALICIOUS

PDF

85.5 KB Created: 2021-10-07 19:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22e5f683cf2a673ebe3c77b32c0e1090 SHA-1: 3e95eff10cf5a77e7651b3c005277ca711100e2b SHA-256: 911e6b7ea6d3eb3199984345a27f2a21e6edc8aa9949700bba2da8aa430f775d
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 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the 'PDF_URI' and 'EMBEDDED_URL' heuristics, which are often used for phishing or downloading further malicious payloads. The sample's structure and numerous external links point towards a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://rimi.sk/userfiles/file/46164455811.pdf In PDF document text
    • http://hud101.vn/webroot/img/posts/files/5980019131.pdfIn PDF document text
    • http://3q1p.com/upload/file/210912041752211001m86kie465zm9.pdfIn PDF document text
    • https://ewt.cz/res/file/rijanefiselazasovelalo.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/20738259477.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210913193034.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/kepopuberetono.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/13016327938.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/utisotugifazenol.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/pisaza.pdfIn PDF document text
    • http://dobermanncz.eu/files/xirigamevuberixojabupef.pdfIn PDF document text
    • https://chineseclothingonline.com/File/56128249367.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/losugijoserepibek.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132435c0a014---12203154086.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202110011646449150.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/19198210452.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///71337599709.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/69810374355.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/wotokujafod.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/xugarigobofepidunidaso.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kenobazewa.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/tepuzarewawixopeseto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=380+volts+to+ampsPDF 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_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 19928 bytes
SHA-256: d135e296dac00dc2e49b763b59fea1fb8b423d3c64f228b90e010638768ab0b0
font_02_sfnt_off00013148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13148 10456 bytes
SHA-256: 34e8bbaf7358af9e44e3512ea1726027835eb1ecc71c75f41601cbde43f8d13f

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