Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be0eb8826ad5f68…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 18:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 537330730b0b9a91620c9dfe84f59446 SHA-1: 25ea2691952ccb17ac91e3f0157b01bd0a020817 SHA-256: 7be0eb8826ad5f6888e3093b2920aae2d8fb717731ae9281f441b2b892eb948f
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier with high confidence. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm. The primary purpose appears to be SEO manipulation or directing users to potentially harmful content hosted on these external sites. No scripts were extracted, and the document body is heavily obfuscated.

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.
  • 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://nipisod.ru/aws?utm_term=what+does+it+mean+when+the+smoke+detector+blinks+red PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467576/normal_5fdee5cc21ce5.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/45617667476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_6011275b2c903.pdfIn PDF document text
    • http://fodefon.getenjoyment.net/accessibility_for_ontarians_with_disabilities_act_2020.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/dasizevirepukuputozanoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvatagukas/iicgcgc/66310011528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_6060286b0330a.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/icdhcmE/wojopofukupor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_601bbc6624998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_6060fa44ef6f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_6010057302b6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446174/normal_604db83973d34.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/URvNcWv/27117082428.pdfIn PDF document text
    • http://pejazadajenatew.getenjoyment.net/14063055190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1dda4824-043e-406b-9213-03d4b91bb4d1.filesusr.com/ugd/7695bb_ab5a46519ba042c5af750c73a30e84a6.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_526f4d2f82d6448485dd9d96d3628dba.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_6794c47630254fa59b295fcf7a7cc71c.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_be7f1409f6634c608ee5999c6194444e.pdf?index=trueIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_92af228f7f334c5f80277128e1bf78fa.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_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 5488 bytes
SHA-256: 2381e37d136b7f3176684f54b12ab9abe530bb362940f5f44088d295e10929d7
font_01_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 10964 bytes
SHA-256: 45df6757f862f430592e578bd7fe383e67d7ab673fe601660bfdb4f006ae60c1

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