Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38f47e3fad0b160…

MALICIOUS

PDF

70.2 KB Created: 2021-09-10 03:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd863eac6b58740d65f6b6facd4701ec SHA-1: 07c4a7b9483f7f892c016e357b20fedf2effff41 SHA-256: b38f47e3fad0b1605657689efde5f5d0fc4c7a07d6c7674b0227ff9154b86305
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is a common technique for malicious PDFs to execute code. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely redirects the user to a link farm of other PDFs, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs. This pattern is often used for SEO poisoning or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/dejufopub.pdf
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/46060894603.pdf
    • http://fuku-zou.com/userfiles/file/nubozerenifovowape.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/zexuditib.pdf
    • http://brain-sh.tw/upload/file/kijaneg.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/43754122140.pdf
    • https://electroagro.es/pub/files/68207256455.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/19760893979.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/92147435187.pdf
    • http://homeopathyhk.com/files/futuxegutidigebaju.pdf
    • http://andlupa.com/userfiles/file/52362699262.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3cd38cd3---6298230970.pdf
    • https://hanyauntuktesting.com/contents/files/23901331110.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/58779904644.pdf
    • http://landpas.pl/upload/file/17177139444.pdf
    • http://elistaprezentow.pl/userfiles/file/jenalutowafazaxolal.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/74299251547.pdf
    • http://scantech3d.com/files/lizasedirewenojidutabe.pdf
    • http://www.darvidproperty.com/news/file/6064634198.pdf
    • http://saaretravel.ee/images/file/vipiti.pdf
    • https://phr4u.com/files/26382612154.pdf
    • https://weyergans-hcc.lv/userfiles/file/gajekilawasikari.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/91649820115.pdf
    • https://gastriklandsbf.se/UserFiles/files/gisukuz.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f053b9922---99532349935.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=avi+video+player+apk
    • 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_off0000b401.bin
8860ff51e2ded2256c63a3891b59b28c181783216acd903ade9ee3fdfbb0ff7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB401 10268 bytes
font_01_sfnt_off0000cb2e.bin
e185a6a83b4429b93460c37e82ba5d82937703fcd21f0df436f98495288f3332		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2E 15768 bytes
font_02_sfnt_off0000f372.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 16792 bytes

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