Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a8b2a49980308d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 01:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59b1ed4f9ba16612fee381bedb288245 SHA-1: 9f7557338cb4a11036ae2150408d08656399d258 SHA-256: a5a8b2a49980308debe5772dcc9b563093493c1e69b2b811802bb6bf61ec04c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The presence of numerous external URIs, including one pointing to 'queure.ru', further supports this. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=handy+soft+keys+apk
    • http://n2nnetworks.com/files/others/95061928932.pdf
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210903_165613.pdf
    • http://mnarch.it/userfiles/files/48064405160.pdf
    • http://otestmanager.com/club/data/userfiles/file/20210918114336.pdf
    • http://mirutte.com/newsfiles/files/48646061606.pdf
    • http://seghers.kr/data/editor/file/107388737661349217afabe.pdf
    • https://home-consult.lu/userfiles/files/14614040102.pdf
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/dukizefotiparezaxupiwuzup.pdf
    • http://parcroyale.hk/userfiles/banasulegotawonituluri.pdf
    • https://aynadakikemalizm.com/resimler/files/mikifuwumipafifunagosade.pdf
    • https://knoxvilleremembers.com/media/87486438880.pdf
    • http://cozycornerexpress.com/uploads/files/70333854452.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/21530024622.pdf
    • http://refpecsbelvaros.hu/kepek/files/bejakoge.pdf
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/lilumidinibixibe.pdf
    • https://dolupin.com/calisma2/files/uploads/309023585.pdf
    • http://cwesp.biz/upload/file/15189079063.pdf
    • http://studiotecnicobonoli.com/userfiles/files/40648996958.pdf
    • http://robbes.nl/media/files/wefoxosumuxan.pdf
    • http://thanhnienxp.com/vietkiendo/upload/file/86169570789.pdf
    • http://digivideos.net/ckfinder/userfiles/files/33609055344.pdf
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901222527547341.pdf
    • https://hum639hb2-hh38.com/contents/files/63960738826.pdf
    • http://vattuxaydunghl.com/userfiles/file/jukefimokizevojufo.pdf
    • 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_off0000da63.bin
c5e267326caef5a77e7752633195f698233978f489eb377612d9c0cf4423e496		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 10452 bytes
font_01_sfnt_off0000f23d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 16792 bytes
font_02_sfnt_off00010a4f.bin
a6ee2dc645efce3ea5b86b149d3b221207c5329fce9cabb9bdf49241ba2e2d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 18936 bytes

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