Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a6b9c0e875a9d1…

MALICIOUS

PDF

79.1 KB Created: 2021-03-25 14:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e26d777b6810eec0c550393f4e764586 SHA-1: c8e272941bbb1e0dff205048b5d266db04ae3864 SHA-256: 18a6b9c0e875a9d132fbd0c484322d6b9dfd3fa15c091d5d1a40e878750755f8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'maypoin.ru' and another to 's3.amazonaws.com'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure and link farm behavior are indicative of a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=horizon+zero+dawn+guide+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465386/normal_5fcce713cd0e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fd05f94ec279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jobavo/danulimixezutavira.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_6fed142b21a64da1b3984067996a87ad.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_ab8635be9c0f404b81e3c8d4f964bf30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d20761-3e06-483e-9d80-0feae5d55dc0/what_lexile_is_series_of_unfortunate_events.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_5343251843c74f3d815472f5206c1ba8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/best_onboarding_templates.pdfIn PDF document text
    • http://dimegebewode.epizy.com/formal_email_job_application.pdfIn PDF document text
    • http://zuwukab.rf.gd/pictograph_worksheets_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63890ce9-fb0d-420d-9afc-929a32ca9052/is_there_a_new_wii_console.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_7da35cd14eb4446b93738dca2e537969.pdf?index=trueIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_8b8347f9693b4dd2ae85f0cf25f410b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8ee9fa-759b-48dd-bd88-ce9584e1e432/ryobi_battery_charger_18v.pdfIn 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_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 5104 bytes
SHA-256: c7a68658091cded630e592956cea3c9dd7ac718c27b16fb18648b0b40c1b8586
font_01_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 11168 bytes
SHA-256: a50cfbcfd3757d776de3f87e80b2531b3cd7a58dbd267c1c53164ef8df6e8ec8

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