Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efa97920d436d66…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 18:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b7832ef19b3ffcb2d89bad405187a79 SHA-1: 9c8fbb407a1748da70b577bde72bfb2c3ae9cd87 SHA-256: 8efa97920d436d664d46904fc5bc3e70094619b1f6a8d26006bbd5bc87d7302e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code within documents. Heuristics indicate it's a phishing or malware distribution lure, with numerous external URIs pointing to disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://infrive.ru/uplcv?utm_term=the+vincent+brothers+pdf PDF link annotation
    • http://ekbdrive.ru/ckfinder/userfiles/files/tibafizizuxajij.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/dived.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/sijixiwetanotebonizumid.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/24963828533.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/57879459164.pdfIn PDF document text
    • http://www.depomatrial.com/file/71397793862.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/30368107940.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/30188602708.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/tefexevexeke.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/16964342143.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/wadekubakutanirizavil.pdfIn PDF document text
    • http://guowangcable.com/d/files/wifuwumuzemup.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/12107246879.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/16153873517.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/javufinepekalel.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/tazekunatuvofubulepatuguv.pdfIn PDF document text
    • http://acril.ru/ufiles/files/44031804819.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/zizax.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/53424123307.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/82304617222.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/liboluvanopo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/29599157965.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/rr7fo092r80f8o40dvvmve2lma/jizexovekisejixag.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/25575367972.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/82802680427.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/nomuzujevosugi.pdfIn PDF document text
    • 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_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 16992 bytes
SHA-256: ce47db21d560b1cec50bd17cfd2dc77bdb9361dcf1cb82f107b386882deab26c
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 10676 bytes
SHA-256: f797608f7121f7acd0bd22d49d1022388e81748f838834ffc4f9f73dd640f0a7