Malicious PDF — malware analysis report

Static analysis result for SHA-256 8245b53864eb1259…

MALICIOUS

PDF

70.9 KB Created: 2021-09-13 13:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d7855551092c443d8b615484a908ebc8 SHA-1: c3c0f4abac13867b6ae3edb8c3f851b029764f68 SHA-256: 8245b53864eb125925f6530310f51b8ac43ce0290dd90caca572e14a534924a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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.tahitotfaluovodak.hu/ckfinder/userfiles/files/kimuguxiwetobib.pdf In PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/60219753718.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/36543526947.pdfIn PDF document text
    • https://ksboutlet.com/file/files/sakegefazugojoxa.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/kemabipubekaretixodume.pdfIn PDF document text
    • https://led7.ru/file/gefopunusu.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/38429193734.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/64334321929.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/gosotitage.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rqk4uol0vb4bcuj0i6oc57ks8f/susepidokexepag.pdfIn PDF document text
    • https://buyafranchise.org/files/files/xuwakefexo.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/wifivapina.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/vaxokizebuwu.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/jesabasopaje.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d06daaad5---dogeropasa.pdfIn PDF document text
    • http://esistore.de/userfiles/file/xesepaboraxo.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/77505835084.pdfIn PDF document text
    • http://domplus.su/userfiles/files/79613266418.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/kazope.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210906020246.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/jurivoso.pdfIn PDF document text
    • http://zubrcup.by/files/files/fabetawireve.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/vagemuvapeker.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/kopatibomomewuwujo.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/kagipolegemawevoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=wwe+2k19+mod+apkPDF 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_off0000b477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 10456 bytes
SHA-256: 6691fb25bfe9c2d0609abf4f75aa648a659c8f405da4317ed5d12540402faa1f
font_02_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 16236 bytes
SHA-256: 2cc506a585dba1030ba42b76978b6b4f764696e7286c099a57119e8f18786836