Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef41ea25dcdc7efa…

MALICIOUS

PDF

46.0 KB Created: 2020-10-29 20:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 08f5f66b641552a46a5993ebffa03cbe SHA-1: 3ecee96c5b72a7d5a5173e4645f7bbc5823dd183 SHA-256: ef41ea25dcdc7efaae0850e3aa4def4abf28f3b6ab59fb593eb592360a84246f
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded links, with at least one pointing to a known malicious redirector. The document body also contains a URL that appears to be part of a lure, specifically referencing a 'rutherford county jail log' to entice clicks. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cctraff.ru/strik?keyword=rutherford+county+jail+log In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5f8eb18fdd6f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5f978f6a75bfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f87181b15bf4.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://cdn.shopify.com/s/files/1/0502/1764/8287/files/vujevanuwizinalifiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5726/1977/files/cuentos_para_pensar_cortos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8899/5007/files/spectrum_remote_codes_ur5u-8780l.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/autocad_architecture_2019_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/5313063452.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9179/4355/files/shell_helix_ultra_5w-40.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4812/2546/files/custom_rom_android_4.4_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9222/3151/files/52460628638.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/buvutelirewolemibip.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/34303104662.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8542/1978/files/cisco_vtp_version_3_configuration_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/wagurovemigimebififew.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/check_font_style_in.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6618 5172 bytes
SHA-256: e5c94b164494b37df772668fe52cfc94cfcf89d06cf702ea2fb688b1904e7537
font_01_sfnt_off000077c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C0 10876 bytes
SHA-256: 4493f9e22d4e7d8db63772c88a5fe5f724166cf7d7d9d7affa0b0ebc8210b4f2
font_02_sfnt_off00009cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CFC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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