Malicious PDF — malware analysis report

Static analysis result for SHA-256 780d0dee12023c9a…

MALICIOUS

PDF

82.1 KB Created: 2021-03-22 14:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 090d23e12d75814cf69287c24f5e4ae5 SHA-1: edfffe2bbc5e72654a10603f7ea57159c148e523 SHA-256: 780d0dee12023c9a625111fd9f46a963817676446caf496bc77c460e93da8fac
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links, indicative of a link farm, with the primary URL pointing to a potential lure document. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests malicious intent, likely to distribute further malware or phishing content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/wix?keyword=pally+pve+mode+guide
    • http://b0xberry.online/the_wire_720p_indexrrtfd.pdf
    • https://cdn-cms.f-static.net/uploads/4477910/normal_605869688b4ae.pdf
    • https://cdn.sqhk.co/vimewiki/chihiZb/kusobaribupow.pdf
    • https://cdn.sqhk.co/wivodojeg/YWsx85I/luduxagakik.pdf
    • http://teaapple.space/mukutixiwamagoraftmgn3.pdf
    • http://joruzutababu.22web.org/92664607329.pdf
    • http://ndfnasg.xyz/government_spending_trim_that_budget_worksheet_answersktfcb.pdf
    • http://cosmosqrab.online/zawuweminizam2e4q.pdf
    • https://cdn.sqhk.co/fogibadeku/JjHXiiv/chuchel_2._0._6_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4478430/normal_5fdd5c525d4ec.pdf
    • http://nuxirofa.iblogger.org/45499028782.pdf
    • https://cdn.sqhk.co/pedidagow/gcjj8Z8/3035750774.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_51d8b56b300545da903b077f5033f78b.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_3448af39dfcf4a17ae25a70ba88cb4db.pdf?index=true
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_b133d324180f4467a04c1bbbf6fa4387.pdf?index=true
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_a12e2c0d10a2473fb62f384282c04bef.pdf?index=true
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_a3d4f007abae4da7a6b8d5ae06ebb9a4.pdf?index=true
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_1777d1a7d40344069efd302045f5f8c4.pdf?index=true
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_1b975eb0a3e84898a25ddd3c5e5a7208.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020c.bin
967d6065c387845ed215687127ef1f54a32cd3bd3fd5607ccb9f1a86d5656959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 5168 bytes
font_01_sfnt_off000113a9.bin
0139c541c2d1bd5490ccbe602e52ebe2d8b922412b13991e18a730cbc66646d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 11248 bytes

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