Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25c2fd386fa53fa…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 00:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8b06ff148ea463ec0f4a34af112efd89 SHA-1: cc5ec63d08e3dcbff433fcc1fc33b64d221fb4ed SHA-256: e25c2fd386fa53fac131b490609bae8f2356d492b712860f1b0dda65a9e5b7cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JS heuristic, which is likely responsible for redirecting the user. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs indicate a link farm designed to host further malicious content, specifically other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://autofactory-jin.com/js/upload/files/24733198973.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7ea5ec887cf4a794a0f38c96beee4f15/sizutivi.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/pomesejawesunab.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/76010094260.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/robiliji.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9dc85a17aa386069621fb93c209d58a3/77572819165.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/jugalubisu.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/23103509877.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/50378303676.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/52209215431.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/23059341652.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/pagim.pdfIn PDF document text
    • http://hidropro.hu/upload/warazaxa.pdfIn PDF document text
    • http://elpijisystem.com/file/jexipexime.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/80926740488.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/dodabujelotalagas.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/tovagidixevikora.pdfIn PDF document text
    • http://haphadoor.com/upload/files/nenalixigu.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/58960750499.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/vozatubavonakisewoxedab.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/64182967683.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/xugejubinowovitokub.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/jutiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+long+is+rotisserie+chicken+good+for+in+the+fridgePDF 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_off0000b2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 17724 bytes
SHA-256: eb5a36772731d376b6c7025fcbf6b4cf0a0c4911f97bd032b1e60f31e0faad19
font_02_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 10764 bytes
SHA-256: 1d430dca0ff706e1f61e308188e707b07afd1f8bb9a2e2ae5d251a3b73f74abb

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