Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30d8523cd0a4ced…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 15:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4640b43ea5c8287accc1a456139c44b SHA-1: b4ea5a08358fe040923222420b2b91a0a7fe5e36 SHA-256: b30d8523cd0a4ced1f6014a688a1b5cd4c39d67520b80c8fc1e4f26a051f4e97
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the URLs. While no scripts were explicitly extracted, the structure suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • 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.
  • 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://atputasbaze.lv/images/userfiles/files/9360574930.pdf In PDF document text
    • http://gloria-eurex.com/images/blog/file/70205954956.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/82988746907.pdfIn PDF document text
    • http://446888.top/userfiles/file/jepagakutabogag.pdfIn PDF document text
    • http://dezis.ru/uploads/files/javalazudog.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0dc3bcd78b07acd50b1534aac9b3d6f2/96305199872.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/33671470440.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/zugakitajixigabuv.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/jomitenesegorote.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/duridejuxoxikirofomerabus.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613434bf4f582---juzosu.pdfIn PDF document text
    • http://falconltd.pl/cache/file/89022956547.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/nafozuxozevafugovivunut.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/bebavotu.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/12747593773.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/46082851639.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/7984942991.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/nupizuwamirokijuridiloguw.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/vafiwamapozazatomisazat.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/daketozuxuwisafeduvek.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/99592045525.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/39845910577.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/jisatejobub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=memory+match+game+android+source+codePDF 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_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 10980 bytes
SHA-256: db0f32c9641b88df6368a9eee4a1e2cbde566196c4a5b8bf118c24b0322433f5
font_01_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 17560 bytes
SHA-256: 2c160aa45866dbad0fdefdefed7571819537fe370766506bb000abc4b287c6f7
font_02_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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