Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b23e30e5baa0796…

MALICIOUS

PDF

101.1 KB Created: 2021-09-17 22:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b98f19126d0aea3514f058159a8002b SHA-1: 798b09776373995870d13acbf56a8b6f00e6df05 SHA-256: 5b23e30e5baa079625cd147b3007efb1ff467f01d8314a27a013341955c6e24a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable domains, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and numerous URLs indicate a high likelihood of malicious intent, possibly involving embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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 https://pixomot.ru/uplcv?utm_term=slug+it+out+apk PDF link annotation
    • http://markone-tools.com/upload/files/68973084222.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/69323854480.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/61045610632.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/35388432849.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/lerakitafise.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/xotabujaza.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210917125921.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/nurevikaxokuxagu.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/dikazonimiwotudaw.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/71887582615.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/940d5552d4d1a912e6003a86188ca385/lebagurivif.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/biwudititevorawewanixe.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/7ba88e1eafc4b3d8867d287989ca617e/pubud.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/bomipadoro.pdfIn PDF document text
    • http://goldmustang.ru/files/files/sadoporireluxoki.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/fosexenigikebegirajak.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/23303187873.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/kuwalujirumezune.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/27541325056.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/69684027035.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/4212072675.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/bilubemebax.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/vuvikekivaxitezenuveli.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/95459790551.pdfIn PDF document text
    • http://remobudostol.pl/pliki/vejirubufimedisutuda.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 27816 bytes
SHA-256: d091ce8f7e3a0dba9aa41d3225426c0c108a3835e596419301cddd21a2ffaca8
font_01_sfnt_off00013447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13447 10192 bytes
SHA-256: 2379476ea5e7f6f4b2b9902401547e253d5bbf80d10f8b5eb48ae1d3961ff056
font_02_sfnt_off00014b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3F 17232 bytes
SHA-256: e9cb9bc9c1933ebbfb0f0b9e6610410eb2c82f8f3209b96d14feae80bddad97b
font_03_sfnt_off0001650e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1650E 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583
font_04_sfnt_off00016e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1