Malicious PDF — malware analysis report

Static analysis result for SHA-256 043b27965c4d9915…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 17:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd62100bba78603578caf276181a843c SHA-1: 251d1e2887ee382a449555a625b1766655291e35 SHA-256: 043b27965c4d9915f0cfa9538d927b09ebfab03eb4651f58214504a191a22ef8
134 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to host malicious files. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.cenlajobinator.com/siteuploads/editorimg/file/bogilobegokufunuratu.pdf
    • http://szsahsh.com/uploads/files/lanosew.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/bixorokadisevavenopaz.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/7593148424.pdf
    • http://platcometals.com/images/file/94068854512.pdf
    • http://wasserburg.pl/userfiles/file/vudaxobas.pdf
    • http://wamaeassociates.com/images/uploads/originals/file/64401253450.pdf
    • http://twozonechickenlasvegas.com/uploads/files/pevazuvinujojamosozo.pdf
    • https://tenekedjieva.com/uploads/file/mulepofavelitetobagimoxav.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/96309133753.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fefd4d2bf1---8222657746.pdf
    • http://tsyrulnikov.ru/upload/file/mefup.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136f812d1823---6158709599.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/kitigiwepudefelo.pdf
    • http://najlepsietorty.sk/uploads/fck/file/14367657684.pdf
    • http://polkovnik.su/upload/file/basovibir.pdf
    • http://triple-a.co.th/ckfinder/userfiles/files/93437105755.pdf
    • http://rts-3.ru/upload/files/98705899463.pdf
    • https://lomasdelaweb.com/userfiles/2008.09/file/87238097909.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/selotej.pdf
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/78404134447.pdf
    • http://stlnsk.ru/uploads/file/40168416835.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/fejabamakatubekezotevazo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+copy+picture+from+gallery+to+instagram+story+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_off0000d48b.bin
c30aa49563f7259ae7dcbaf58ddab744f420d1520973867d01bdf7f3e8b2e132		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD48B 11252 bytes
font_01_sfnt_off0000eec2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 16792 bytes
font_02_sfnt_off000106d4.bin
19a3134337b75baa4f6fc70232faaf15ad261abf844bba56c47eb715b277c40d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 17468 bytes

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