Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aed83a73e905d82…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 11:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01d394b1d155447ed5eeaf8c9f68e098 SHA-1: 5102ec635cb076067916972228c026558ffec118 SHA-256: 4aed83a73e905d820516855c17b4f98f1fc68fae2572879ce4c2eb8ba1d46d76
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains a large number of 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 related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fullcolorspandoeken.nl/userfiles/file/bojiralinawefufidato.pdf
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/83364940817.pdf
    • http://seidels-mineralienwelt.de/images/uploaded/file/zamimewabis.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/97658343422.pdf
    • http://www.focitabor.hu/userfiles/file/gewigudu.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c571114e8---xajara.pdf
    • https://satesayap.com/contents/files/rokimupakiluzasosedupeje.pdf
    • http://chinalabware.es/d/files/zusipet.pdf
    • http://fmmvn.net/userfiles/files/48907175233.pdf
    • http://eternalcycle.com/FCKFiles/file/70671140557.pdf
    • https://dansobentre.net/uploads/file/48332930110.pdf
    • http://polishingmarblefloor.it/userfiles/files/xatejoxibojojomere.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/93272132170.pdf
    • https://mattress-leader.com/media/vabonixi.pdf
    • http://huanghels.com/filespath/files/20210913035819.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/morixafuj.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62696907328.pdf
    • https://kawanmto.com/contents/files/71906240419.pdf
    • https://kirmatas.com/userfiles/file/kubosumigibulun.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5lhl7pu9r9pou7bn5en7j1jj60/mimugobetizedejexovugu.pdf
    • https://adminico.nl/userfiles/file/tapigisutinidozapa.pdf
    • http://satcomlink.com/userData/board/file/99559335890.pdf
    • http://pk.mo/userfiles/file/jubidaxaxed.pdf
    • http://denda.co.kr/ckfinder/userfiles/files/69964004373.pdf
    • https://chezgregoire.fr/userfiles/tevafewolulab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=shoutout+app+for+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_off0000ea92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 16792 bytes
font_01_sfnt_off000102a9.bin
69e1c208ee469eebbf5e64c322527cf91a667f05c58fb2dc6ef72bfc98de1229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 10424 bytes
font_02_sfnt_off00011a35.bin
010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 18056 bytes

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