Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd77c5a22c580038…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 19:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 771212d457db3022c0fc4dbf50377994 SHA-1: 92625e8e13246052912f65beb465eeaecf0e4b5c SHA-256: dd77c5a22c580038d5ac8038a0f13a26804c1a54647ba31449bbd6918bd0a689
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 exploiting PDF vulnerabilities. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document, which are characteristic of phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1fd76466f---xitasanos.pdf In PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/2551113945.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/11460650548.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/85142277524.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/sukarijugepenufawixebo.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/bafukibuv.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/ropobusofajexepigogiziwi.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/laladenozosivo.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/93826386974.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/toguja.pdfIn PDF document text
    • http://tcihk.com/userfiles/97897851602.pdfIn PDF document text
    • http://donghotam.com/luutru/files/5621347093.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/woviraf.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/xekenibekipakedomilu.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/fofobivij.pdfIn PDF document text
    • https://quizai.com/uploads/files/vosivokodagowu.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/jozasubela.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/005cc6cf1b7fc7d1d8fd1dc05532d0a6/97281804250.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/pumuxevaratosalabakinep.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/70770790589.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/37912125168.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/zirujuwikaxinagor.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/dujuwufufaparuvekoxe.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/winakorupalud.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/dijegosapadibobepulasiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+vampire+diaries+season+2+123moviesPDF 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_off0000bc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC28 16868 bytes
SHA-256: 67c1fe81da83d20a39545177c615d337d8267e38eb173be5efb072fc8d0d30d8
font_01_sfnt_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 10888 bytes
SHA-256: 25eeeb5e61ea087fb0914abf0be66d78f299c91f773f354aa79ae25f173838b8