Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ec447ed3242735…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 23:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7aa6e8a17f07aeca211cd4ffb1c8e8d SHA-1: d2375e9b76a033858564a6a5f38f08e1dcd120d5 SHA-256: e5ec447ed324273578cb49d08893e8ae6bbd00ac8ae5ba768497a294f133e957
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://creptiles.dk/userfiles/file/547442792.pdf In PDF document text
    • http://chongthamnguoc.vn/img/files/30770490687.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/vekiv.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/wimuzivinas.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/5452180594.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/73360023116.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/gesabopami.pdfIn PDF document text
    • http://trubaopt.ru/content/file/60689849131.pdfIn PDF document text
    • https://pr-dienst.ch/file/lululujo.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210918103757.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/33344587814.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/58157814199.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/97049608178.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/66343519091.pdfIn PDF document text
    • https://thietbigas.net/media/files/45220596516.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8dcc3b4ad793f331d5f6cebebb4eda3a/2252502337.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/mawejo.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/19440690331.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/musujukizis.pdfIn PDF document text
    • https://lorus.rs/files/damifejufesiko.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/desetatiguwelipepa.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/mofedufuzagalosudixosus.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/31592058837.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/26455694682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+meaning+in+tamil+dictionaryPDF 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_off0000c7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CF 18748 bytes
SHA-256: 12ddb4727348afd5efa8f9efc68401491099e0e05f5ae55ac39c806869de92be
font_01_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 10640 bytes
SHA-256: e9aa927afc875e5fea0403564e34dc86b2e737cc7282a9915c1d8005850d9229

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