Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8c1e614c9ed601…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 04:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 083be3e56822e790dfb712785f8e8647 SHA-1: d3164484a902eaca883fa8ac844d35b38d9ce228 SHA-256: 5c8c1e614c9ed6012537443763a5b727a5913d61e8a735d23875308c68e5e8a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external sites and are identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://briljant-maleri.se/UserFiles/files/vududupugexerewu.pdf
    • https://bauarch.bg/files/xefutefijanug.pdf
    • https://petribax.com/userfiles/file/xekejidubopiredoviredix.pdf
    • http://www.anaja-inter.org/public/file/dexawotolaf.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a02b1a04---27098408510.pdf
    • https://ciar.vn/uploads/image/files/bepitoxorajabulopodasud.pdf
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34899750993.pdf
    • http://orderleesushi.com/uploads/files/dabakat.pdf
    • https://keepingscore.org/userfiles/file/besazesedogovo.pdf
    • http://elijasprojekts.lv/files/file/xafutisamazugifiw.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/jebekipevobufemoluzaz.pdf
    • http://rulada.by/upload/editor/files/96036296864.pdf
    • http://dydlhx.com/upfiles/file///lopeselaganexewoje.pdf
    • http://usaoxin.com/userfiles/2021-9/file/61254119723.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161539381b7f88---5828592580.pdf
    • http://tcihk.com/userfiles/39752009677.pdf
    • http://teamtrinity.net/trinitya/file/9662664842.pdf
    • https://mamotato.ro/userfiles/file/88881628760.pdf
    • http://gemaeldeundobjekte.de/uploads/files/koxopasodesavejuz.pdf
    • https://zenit-npk.ru/files/file/riwavew.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/82500996350.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+minecraft+pe+1.16+nether+update+apk+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aad9.bin
6df8c6bf2ec4ed5a1f78c0acc16a9f00e6c9ab8dd61d0321ac904eedad8c9637
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD9 11280 bytes
font_01_sfnt_off0000c533.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC533 16792 bytes
font_02_sfnt_off0000dd45.bin
f8ef556775dda2e1e54254f57cfdba4e436e285bbf6f44e92fd4967b37120834
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 14944 bytes