Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dd3f3915cc34fc…

MALICIOUS

PDF

71.8 KB Created: 2021-10-02 11:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3003235421560a768de5b330da6cec23 SHA-1: fcd9c5e057f7defca1cb31edc7368d639430a66d SHA-256: c5dd3f3915cc34fc970f3ad885ff4517dd6039906d08eb6c1fe223b68b753bbd
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or trojan delivery. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://uniondrygoods.com/fckeditor/userfiles/file/17090587967.pdf In PDF document text
    • https://kurek-rowery.pl/user_pict/file/35449227.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/delubetidujedusegofedew.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/89063190569.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/8828065833.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/7757197101.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/75760343321.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/48161641586.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/88660957793.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/22010062339.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f190fa15c67878ff3eaebbea82d36794/97424475658.pdfIn PDF document text
    • http://lizhechem.com/upload/files/18319332166.pdfIn PDF document text
    • http://contextuae.com/resimler/files/nosidovipubeleboliju.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/wagupuxitawugataf.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/riwewoxofenejana.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/20821046909.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/zisejuxirexujub.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/wikodogewotanewegiki.pdfIn PDF document text
    • https://activepymes.com/pub/file/xagasofito.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/64202500171.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/99567215361.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xopezoge.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/getawufo.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/28747324047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=scripture+teach+a+child+in+the+wayPDF 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_off0000b319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 10696 bytes
SHA-256: 38b6c790ddf44348b5bcb5b80fcbaab7816175207cf23cca694f4769d74ef6ce
font_02_sfnt_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 17332 bytes
SHA-256: 215d84b631458fc8a6f26b4db309b8165b3c94ab951d91df9e174fe15249b911