Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bd7bec7df47a83…

MALICIOUS

PDF

88.0 KB Created: 2021-09-09 06:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 401f1d0e2501d719d4a3d9ab6db6d6ce SHA-1: a71470178480e6fdb4dd793cb3457a78e6f46af9 SHA-256: d8bd7bec7df47a83fcffcad1aa712e1a2f9952033791cc179178d110ff049d08
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on potentially disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is a link farm designed to redirect users to other sites. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://softwaretesting.kr/club/data/userfiles/file/20210909111256.pdf In PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/67386239568.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/60060863572.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/18303278684.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/51026297300.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/11792437758.pdfIn PDF document text
    • https://triosms.com/userfiles/file/79084126917.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/85550683908.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/80998569319.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/79594126283.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/raxovuxubiwikif.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/92289173452.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/jugofinetelutiwomubo.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210905_58868AD82F347245.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/53229980600.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c77d174b8b3d1acf490ae34249837d79/notigejibepetobaf.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37977536135.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/77102481147.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/namotonavito.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/loravozopupigixevati.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/25747207793.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/tunufobadutipeliven.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/25391654117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mortal+kombat+movie+running+timePDF 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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 19120 bytes
SHA-256: 24ddb9eeefc37cb74032b614f085bc19a452fc345b9b345014951a6cdac2eadf
font_02_sfnt_off00013a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7C 10672 bytes
SHA-256: ca1802c115225a2beefaad277e9d42d112cf1d9ec06d6e92647b4cd4d1821b8d

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