Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9e5921edd41c70…

MALICIOUS

PDF

84.0 KB Created: 2021-03-14 15:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1b0676d6cc832ac3de19bbefe6554c18 SHA-1: 6a01781464eba5cab2a20cc039692ba7099b5dff SHA-256: bd9e5921edd41c7079017c10893e418137d850dac2742b4a394985b5addba260
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/123?utm_term=argentina+super+league+table+and+forms PDF link annotation
    • http://phillipen.online/all_the_bright_places_quotes_with_page_numbersjn4bf.pdfIn PDF document text
    • http://naturalgood.space/rock_out_loud_whiteboard9ry9n.pdfIn PDF document text
    • http://idslim-italia.site/mipetexawizazogamelumeak9g0.pdfIn PDF document text
    • http://fevuworejefe.iblogger.org/tekonurilexonalilenonevob.pdfIn PDF document text
    • http://zokumujanuni.iblogger.org/vubuwizodadewutikesobu.pdfIn PDF document text
    • http://khareedforosh.com/clt_full_form_in_education7hlhg.pdfIn PDF document text
    • http://kdghy.online/vusupebosw3976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_bd4c56920c494dec8eab5a5f9d829e0e.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_bea21136a37d43d2a168cb80270bb2aa.pdf?index=trueIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_71cbbf4d13434dba8d83a48d761e828f.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_b55c24c505f24cd4981b77ab20239607.pdf?index=trueIn PDF document text
    • http://beritoka.rf.gd/pronoun_antecedent_practice.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_9a04864dc18c47759479b8b068a053d3.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_d7fad62ff4504f3d95c87b8a9127272d.pdf?index=trueIn PDF document text
    • http://mubomapobe.epizy.com/82974216118.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_e2f7c97c1a244282a0093f183b6a9fc2.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_119e5fe2aa874af58f0e5ddcbfe29df5.pdf?index=trueIn PDF document text
    • https://f0d491a7-7d72-4eea-bbd3-72ad31f48a9a.filesusr.com/ugd/1acdab_e472e14fc77b409daa3bf0f29c731119.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_8f60a4a714d747d781f7a73e3a34e3a7.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_82caa8d7df8541d6b7814a964a5097a0.pdf?index=trueIn PDF document text
    • http://lafasusatar.rf.gd/contemplate_life.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_23a6f5d99a894453909bbb52c72d4ddb.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_28feebb47192430182b99cc5884793b4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 5492 bytes
SHA-256: 36e1a757c3b61c32ecc5db6dc95dc5c944a6442910d77e2e62c19201d87a0df8
font_01_sfnt_off00011af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 11792 bytes
SHA-256: 2f21356e401b3f0fed434a199f38efded9b5b9b9d3ab48ab43a8a0f1f47da5e8

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