Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20222020d566b3f…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 18:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1193ba9f8b9d46779fdc14b298e2f4d2 SHA-1: af66a73811a84d3225e02387e18feb97fe8a0e3e SHA-256: b20222020d566b3f4ef6ca347f39a9183c06abf09ad68b31a8a69540c20c349c
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are on disposable hosting. The ML classifier strongly indicates maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document's purpose is to manipulate search engine results or redirect users to potentially harmful sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=best+gba+rom+hacks+2020 PDF link annotation
    • http://cissi.it/userfiles/files/bawafeki.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/19707836237.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/vefuwubivanajawixokoted.pdfIn PDF document text
    • http://ijfbn.com/editor_up/69722174098.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/7951449482.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/vifujasigupabutalukuz.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/tesikakinujilusum.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210902195019.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/84764818764.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/pupuseguxu.pdfIn PDF document text
    • https://webhosting4.net/media/file/nugubirumigikelovuxu.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/66180579490.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/padabisudok.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/kolunafum.pdfIn PDF document text
    • https://mytopics.it/uploads/file/rilumi.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/zifimigopexo.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109200307318113.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/33334339447.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/cb7be9aee57a0ce5f6e5abe41c7570da/15884010015.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/4636357523.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631174974_a6902babf3.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/83127827711.pdfIn PDF document text
    • 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_off0000b02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC842 10960 bytes
SHA-256: 22f130cb7e49abf8eda5eec231c3f76a8933678057d4fa5d645c93bfccad8be2
font_02_sfnt_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 15180 bytes
SHA-256: 880a1804ac6ebafedfe438004e4a82b65fae0c2c27103962dd3f171b87cdb10e

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