Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdc574cd9bbd864…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 00:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e4948e34f2d735238ceeb7824a32528 SHA-1: a57abeaf637d7a5cbe354601edfbdab36cfb8298 SHA-256: 1bdc574cd9bbd864d0353453c51a2a5d3b288ed33c06b5a89b03b71655b2ffe5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links on disposable domains, pointing towards a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the nature of the PDF heuristics suggest it may be used to redirect users to malicious sites or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://eventclub.pl/userfiles/file/vurofizugedu.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143b68bbfdfe---45603475119.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/97199158162.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/falawuruforos.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/ruteb.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/59618286857.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/tagudibozedubasilanatuxup.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/25649191503.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/derog.pdfIn PDF document text
    • http://superazs.ru/images/news/file/sebemekujopopibetexasad.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/tedifo.pdfIn PDF document text
    • https://dacola.com/upload/files/52701659062.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/11159584102.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245aa2b8f3---vugozifeganejev.pdfIn PDF document text
    • http://szwygs.com/upload/45841487018.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/70916673370.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/lipebozurojera.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/jizagaralunujofajujiw.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///xufet.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/vudavumak.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/75392409169.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/tasiwan.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/67730432123.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/71636535952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+important+latitude+line+runs+through+europePDF 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_off0000c6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AF 17048 bytes
SHA-256: e4892ed6fbb591adf607b9f723f312a008859c035f61647252489db9bc6b0dd5
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 10932 bytes
SHA-256: d742f8698f1d65cbbb78926c7b2eec9b211c625954e73160af9b48dea597b000