Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4940a6fbd1bb48…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 15:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0675412a67628ad8522eb412c6e15c05 SHA-1: 38381e2158930f4933d902789d2c03cd5b591cc9 SHA-256: ab4940a6fbd1bb4827ceaf1b7a500c0edce8302325cd7cb675db6b4d83215d14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the embedded links.

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 http://wsmr.us/userfiles/file/gikemumojerim.pdf
    • https://vinamex.info/uploads/news_file/bazazegulovaxatovopezavu.pdf
    • http://finadev-groupe.com/userfiles/file/gidavodezizaruji.pdf
    • https://divanich96.ru/admin/ckfinder/userfiles/files/kufaxitadenu.pdf
    • https://buzascsaba.hu/userFiles/file/66068074215.pdf
    • http://apexnepaltravel.com/userfiles/file/vixabojekoda.pdf
    • http://sooam.com/files/fckeditor/file/9330371836139a4b64555a.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2f90f011e---rijulimixipidem.pdf
    • http://nikolalepojevic5.com/multimedia/file/xozukasosuxugejaketekix.pdf
    • http://pc580.cn/upload_fck/file/2021-9-18/20210918142845251208.pdf
    • https://funbugs.ie/files/file/pimikoxetefu.pdf
    • https://zdravka.hlpr.hr/userfiles/file/sezumenu.pdf
    • https://internationalmedia.com/userfiles/file/79553591845.pdf
    • http://chuabenhxuongkhop24h.com/images/files/68183249003.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69549659129.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/wurabefixovimi.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/52588386868.pdf
    • http://pnc21.com/files/fckeditor/file/126131671461310dc824022.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/sirererupo.pdf
    • http://thanhnienxp.com/vietkiendo/upload/file/17913488518.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07046be05---vejelit.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/47888771980.pdf
    • https://wct.goldcrownresort.com/magazine_files/files/laminuzowelamiw.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/16592031178.pdf
    • http://janaturismointegrato.com/uploads/file/92875632301.pdf
    • https://unaizahic.com/Files/files/rubizigebuxokitirut.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/51856223800.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=group+chat+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_off0000b606.bin
08af2ffa847eadccb30b6aa0cbd8cba320f7798ebf338e3f7c686269d8e5c78a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB606 15960 bytes
font_01_sfnt_off0000de9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 16792 bytes
font_02_sfnt_off0000f6b1.bin
bab202029f5ab431f936d3fab0399d820941ae94f081d3a2f61e177506aee5f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 10404 bytes

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