Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfee09abc549597…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 05:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 040dc66462b088ebec241eda3bf51c08 SHA-1: 98f2f4fe226501b615d6febeaf506ce0e7ddb82d SHA-256: 8dfee09abc5495976b91b5eb6e3f2f4e82e292de95452bf246d0d484bb0562ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and a link farm heuristic suggests an attempt to redirect users to malicious sites or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/55239092789.pdf In PDF document text
    • http://avanti.pl/userfiles/file/dubakaxonevidatefobofe.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210908081649.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/lujuvirufologaxamerofuma.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/zamemesoraweporap.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/51711923487.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4efbe7471---14313310415.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/12565574117.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/3298326912.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/simotemivumerizexekinan.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/nupaxorasujovaf.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/vasuvagivob.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/75219022023.pdfIn PDF document text
    • http://lawngo.net/fckfiles/80523209991.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/dejoraniwijikirironud.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/23237172419.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/32385666525.pdfIn PDF document text
    • http://skolky.info/foto/images/file/28244480412.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/sinulejimadewu.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15876287863.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/91063853466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=top+war+games+for+androidPDF 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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 10748 bytes
SHA-256: fc1f01b07dbf592ba151b20a7392b0d66cc172e79a33e04266661f5de1017b4e
font_02_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 17172 bytes
SHA-256: 5200a619c63d238eb3eb86056581a8914bba9786e124e8473b4711dd04cc1709

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