Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8161aec01e25aad…

MALICIOUS

PDF

68.6 KB Created: 2021-10-02 21:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ee0168fe1d69818328c39314ea6cab9f SHA-1: 0af5726a8e58789419cfd6167e15a74c8a949b0f SHA-256: d8161aec01e25aad8c3a8966884ea8be564f584d9152dac23cbbede41660e1fe
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. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/72614668477.pdf In PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/4325133906.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/runegafeboveworifudesuf.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/dijidowixu.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/6704448624.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/79406435333.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/lizefetasemun.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/34424035401.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/006492d6c8804fa436af6c62b5918aa3.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/foterajezutebosoxejamogaf.pdfIn PDF document text
    • http://exima.kr/userData/board/file/32078313821.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/30051732234.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fofubuvaxuromulu.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/sebidefinufebojomixuta.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4171a31468e2aab1acf8c73af39b9615/47066278173.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/komusekowizegob.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/viporuwovuwem.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/78594644781.pdfIn PDF document text
    • http://seasplendorpetro.com/userfiles/73824831977.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/bojawifatekuxemax.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/26318416665.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/7930989628.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b451aaacdf3c4f1a7b095b13a85286b5/serotasumotuzud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+instead+ofPDF 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_off0000ae68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE68 10376 bytes
SHA-256: 191f7d93bafbba54c67a1806321d000234d46571c3bce00aa8f73112ccdc7a57
font_01_sfnt_off0000c5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CD 15400 bytes
SHA-256: 38d3ff5543dea067fc5dfbdfb067ced50395f4b0f7a9fa94c91100dfab031a3c
font_02_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1