Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ced04eb96c9d163…

MALICIOUS

PDF

91.2 KB Created: 2021-09-18 04:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 093202ed9c84edc97778b4f7fc5b2a5e SHA-1: 8f49a3f1f5d32dfed7c1f176abdfce637988cbb8 SHA-256: 4ced04eb96c9d163a64acf6511c076856f5187ebca1ccf34824cdc9059b1531b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious or unknown domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ed4369eb708ade4059a502bd78dd28e7/midowogu.pdf In PDF document text
    • http://bookblog.kr/data/file/files/14859186256.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/41366922184.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/8114387787.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/1933343818.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/numasekarud.pdfIn PDF document text
    • https://media-get.com/userfiles/files/17731059453.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/vaxajaj.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/xisonegej.pdfIn PDF document text
    • https://penzion-palice.cz/content/89599982163.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/96123584647.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/losutikinula.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/mapewaxibiburomalom.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/pusizavapifonis.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/57691282105.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911022018.pdfIn PDF document text
    • https://eetravel.net/file/molagux.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/nativ.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441fa02cca9---vobiwidudebulagabeka.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/rawamumijexus.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/50476036910.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/xuzifezisefosokepozamav.pdfIn PDF document text
    • http://garderoba.sk/images/_file/xibobanafazosoliralad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=igo+primo+2.4+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_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 20956 bytes
SHA-256: 3306ca591d22bd177afde0af0324b35f2de4e30d0758e785020e48a52f774781
font_01_sfnt_off00012f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F86 10504 bytes
SHA-256: d2f21e9ee3ee839991a173f55bcf0aa5b9a42a23148523d42a2b9c056fa54605
font_02_sfnt_off00014738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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