Malicious PDF — malware analysis report

Static analysis result for SHA-256 549087bee7b971cc…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 11:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73f5a7693cc0d23b82103ac7154a1f00 SHA-1: 55d116a31b96c36779e5f23954ec66302c6e7484 SHA-256: 549087bee7b971cc9a6c1bde22683d734bc5b9e511517a8c63a0f7bf7b96b7e0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The numerous external URIs, many pointing to PDF files on potentially disposable domains, suggest a link farm or redirection infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/75730634303.pdf In PDF document text
    • http://dzirerealtors.com/uploads/veramebaj.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/88076536217.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/83561323910.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133d45e1d76d---vazexavebuxafuge.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/jizub.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/60717611857.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/xelafawabeka.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/sekowaz.pdfIn PDF document text
    • https://carlojans.com/cms/file/xumexotemukamoru.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/79463693469.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/bupedepenupugi.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/bebofuriguxepo.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/3153291045.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210905_2E69839D09A61598.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7a12779417fc75e6f3268d68c945c55/ziwikimupowuvaridixafuf.pdfIn PDF document text
    • http://hijoin.hu/editor_up/gijesi.pdfIn PDF document text
    • http://dd-eng.com/files/files/3396232794.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/35250124210.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/78000349226.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/54250467107.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/70937986219.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/72725695598.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/96833838123.pdfIn PDF document text
    • http://dfanchem.com/upload/files/vapoporururofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=como+descargar+emulador+neo+geo+para+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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 10888 bytes
SHA-256: 895c856062324758a04bfcf95027757740a8c944587d9bf0b7aac6990ed0f08d
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 19376 bytes
SHA-256: 3a3b5cd12dc0ccfc0b9bbaf317fa9088b112b7f77838dafc1066c24042e5b602
font_02_sfnt_off0001283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1