Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee3790a331a09fa…

MALICIOUS

PDF

79.9 KB Created: 2021-03-29 02:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e13b2d1574176090cf9c839327624242 SHA-1: 597b7fb2e029d306db5ae6a8a02e0bbb673ed21e SHA-256: 2ee3790a331a09facd729e6a9d193fac5e4b5907a6e52a462c611ebd118ac6eb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=how+long+are+costco+car+seats+good+for PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366385/normal_6025ce2e25eb6.pdfIn PDF document text
    • http://brightshopbg.xyz/lhs_ballpark_font6w01s.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/silozojixoxebesiwikira.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/wefen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_5fd89f8b1eeb1.pdfIn PDF document text
    • http://interplast.ru/valetubutowewaujx96.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/beethoven_moonlight_sonata_guitar_tab.pdfIn PDF document text
    • http://samyog.ru/76824918912k2azp.pdfIn PDF document text
    • http://mmmuuuue.space/21204309723jg4yr.pdfIn PDF document text
    • http://chebsvet.ru/zunebapuwn6mc.pdfIn PDF document text
    • http://3gusevshop.space/nipuxufixebidflj1u.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/79608860516.pdfIn PDF document text
    • http://pshcomonhere.xyz/83832546572gc6yt.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/is_billy_elliot_on_netflix_canada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_f94681bdad4b4a4681c15fbd303c2612.pdf?index=trueIn PDF document text
    • https://0816b8db-db6e-4af9-a106-1766ff0f8d73.filesusr.com/ugd/06e6c8_9333c2a906014382b0f51a38f980e14c.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_3d2e45998b8b4bf792132f8472e41a4d.pdf?index=trueIn PDF document text
    • https://a8a57b57-a5e9-4b5c-b824-02731ce3a1bd.filesusr.com/ugd/cfa667_88b42a6690d64aae88518725a5c3249e.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_b16730753105413580011e7c68d7e0be.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_d6d0bcc4bf4445e7a9f74ca673129b13.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_4eceaf00007641c18ec6a3d4a15f0865.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_f277058a68d148a485c57e2d91c3e190.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_fb1031725ac24f27a72a1a82871fb06a.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_169ca5473a454f6c87f61d35d9d6c0b7.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 4984 bytes
SHA-256: d9d7d2662f2f1dc022182c3788dc5d1b4e8fe3f9f2764c209f764e13fac8dc1a
font_01_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 11124 bytes
SHA-256: 309a1eea19de8e9d280d31bef55f9d3a0598ca5c42ef3a0507f96889bc493e83
font_02_sfnt_off000123ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378