Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb64c06a642f1235…

MALICIOUS

PDF

85.7 KB Created: 2021-09-10 01:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52cf4552eebd60b42a938074ec5969e4 SHA-1: 41aab279c725698913eea369fdaa1e7569199820 SHA-256: bb64c06a642f12359bf2bb3ac8a4dcea8e02c46548e4843a518d5be26612c72c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan delivery attempt. The heuristics suggest it uses social engineering tactics, specifically a fake download button and a lure for a required browser update, to trick users into downloading malicious content. The embedded URLs likely lead to further stages of the attack, such as downloading malware or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=pokemon+ash+gray+zip+file PDF link annotation
    • http://studiocommercialedelpiano.it/userfiles/files/48916063390.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2a3b486c582ad68d26c2cad8e03c668d/93430183572.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/mugidugitexijagogovotit.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/penilevewetipu.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/20991223897.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/66927127455.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///vavute.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/92277165996.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/denubigiwuwenoz.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/74549998934.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/78019470623.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/womufebunugob.pdfIn PDF document text
    • http://www.pvvc.cz/files/xokizaw.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/guvebelazexa.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/gatulex.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/39413251286.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/polafejezabogosixifamarim.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/38552016621.pdfIn PDF document text
    • https://strechybenesov.cz/content/95537216306.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f363b7b09b---gemiguvalowuwozolul.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/76554940354.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/faxufir.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/mekowawemume.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_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 10972 bytes
SHA-256: 4a557b5fe2de7746b8fc0993bb904c22d4c581cf61f55aeaf5147e713c998dce
font_01_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 19200 bytes
SHA-256: de33aeaa225230727bb38390702605c73cccd375d428d3f502b1a17043bee934