Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a61afbfd8f9012…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 10:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f2baf5c602844b9a32324e2248eb5a7 SHA-1: 77e3b102c143958591e61b681e78647f16179e8b SHA-256: 59a61afbfd8f9012a64d30474633eb3d850c78e353754dc433a21422bd75649f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of distinct hosts with few links per host. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://alharithiforcameras.com/ckfinder/userfiles/files/39613073991.pdf
    • http://gorisum.net/fckeditor/upload_file/file/kisik.pdf
    • http://seamcc.com/UserFiles/files/59607010316.pdf
    • http://superazs.ru/images/news/file/pokepuwuvemudut.pdf
    • http://tivatijapan.com/uploads/userfiles/file/32167075973.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/99804409858.pdf
    • https://anfauglir.com/images/file/katatenirevadutibim.pdf
    • http://crmrealty360degree.in/userfiles/file/65130510314.pdf
    • http://tupnate.com/ckfinder/userfiles/files/wefawimixezozejukuge.pdf
    • http://humanitool.ru/userfiles/file/vidatakogefulekujowimexen.pdf
    • http://dalaichau.com/files/4018078283.pdf
    • https://bursakaynak.com/userfiles/file/5765345318.pdf
    • http://tostonet.cl/ckfinder/userfiles/files/gifafunadugilazudelage.pdf
    • https://ce-mi.pl/uploads/userfiles/files/tafekoj.pdf
    • http://pietroquatriniarchitetto.eu/userfiles/files/gosuzixivonunez.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/sidulepogimidone.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/93170703777.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/suganorizu.pdf
    • http://nutrizionisti.eu/public/thread/risorse/file/39463533388.pdf
    • https://lordoptika.hu/files/files/91726625104.pdf
    • http://dobrejaja.com/Upload/file/92178532087.pdf
    • http://agisma.ru/files/pages/files/folusawukoz.pdf
    • https://hanyauntuktesting.com/contents/files/nojipewodosafovodit.pdf
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jesogesinafenopow.pdf
    • http://tnslib.tools/userfiles/files/gotawara.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/jasemivunilejoloze.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/40343752863.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=touchgrind+bmx+2+android+download
    • 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_off0000b4f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F0 16792 bytes
font_01_sfnt_off0000cd02.bin
f028e85f3157c6c7a7a88198d40d443dce807449cf8bfdf038e82145aabf6177		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 14628 bytes
font_02_sfnt_off0000f1af.bin
60217bfcfd5ef5dd4a303ffc845e16b0d9cb2bf76a32751577a11b75cb6a8342		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 10928 bytes

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