Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d406d899dfb11f…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 04:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d52c674b9b9e176cb734785ca90571ad SHA-1: fcdf4806fc9b5242e35e94d6d894a371f1eddf12 SHA-256: 26d406d899dfb11f2432cf646b3e348c3e8f013be669d8ca0a12331a100dfc57
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as an image-only lure, typical of phishing campaigns, which contains numerous embedded URLs. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to redirect users. The primary attack pattern involves tricking the user into clicking a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/34322970741.pdf In PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/medenasudob.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/ketoniratepuwitek.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/turive.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/nnn0ql7d2akdbn9sq04apo3ndt/lolokenefipepuvolar.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/60915452450.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/62894520987.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/fekarakodadivutirakur.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/tosadulunejarufedij.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/53638790015.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152231a21e72---fajadakomizilusimel.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/9803915159.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/dekatekipupukigago.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/jesizejet.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/84604276375.pdfIn PDF document text
    • https://togeltop.com/contents/files/molorapurabubexiva.pdfIn PDF document text
    • http://czyxchem.com/upload/files/70341725535.pdfIn PDF document text
    • https://derfo.info/resimler/files/11375886193.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/44706290237.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/47442339932.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/gatukebesinozavuleli.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/181448118410.pdfIn PDF document text
    • http://mega.kz/media/upload/files/3178694707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+drag+racingPDF 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_off0000b0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 10088 bytes
SHA-256: aad34749fde5f65d010674e4804df82bcc3519e21beb1e94fc9a93d7b53628bc
font_02_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 14288 bytes
SHA-256: cc72a75f32efa3244056942df1bbc06762426d2a936b874534e3a6cfb8a72d5e