Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d119f884c7d669…

MALICIOUS

PDF

74.7 KB Created: 2021-09-23 01:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4ff9f656aec1f741691fbc126848dee SHA-1: b3d83576c196aeca36ca4f1b1dd27982d258193f SHA-256: e8d119f884c7d669cf95bcbd115ecd570cc0d9206489858ccce6d4718d702c51
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It exhibits characteristics of a link farm, with numerous distinct URLs pointing to PDF files, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ezsprinting.com/userfiles/file/vorosamu.pdf In PDF document text
    • http://connectcontrol.net/files/userfiles/files/86216357635.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/lubitom.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/62263005117.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/54439118764.pdfIn PDF document text
    • http://www.moyekolodin.com/files/97957002216.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/dijagilazinase.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210919030657.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/13340123971.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/598982628.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/dowiruzosewubirozivum.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/gotedofosemunipezijoram.pdfIn PDF document text
    • http://chinahongji.com/d/files/roligimalosizowavis.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/kubexugalub.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/41177135680.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/levojosojiwubokameba.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/93857142796.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/1436403008.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/sepezukuzipimeka.pdfIn PDF document text
    • http://yepuco.com/uploads/files/gitukeweluwunadis.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/42804827175.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613c9e92d1c2f.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413945cf2f6---48565157619.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/dajujap.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xatekidij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=125+degrees+in+radiansPDF 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_off0000c1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AF 16920 bytes
SHA-256: d63276c40b714148eeae2601650d3ceb93548703c737b1afac04fc53df129b49
font_01_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 10368 bytes
SHA-256: 03c34976639706f9b863f918e02cc99a1c07c24037ce28e01579484bb768ee1a
font_02_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1