Malicious PDF — malware analysis report

Static analysis result for SHA-256 23af80b9f73161e5…

MALICIOUS

PDF

38.6 KB Created: 2020-10-27 01:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 17475755e0532a375930058359422ca3 SHA-1: 39ab67eb76096390a4b8381c3aff6a92bf2d1328 SHA-256: 23af80b9f73161e5dbe1c1c4cacc9fdda0321ccff7d13d86b9a6405d67ce5a79
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to redirector infrastructure identified as malicious. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, indicating a pattern of linking to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to malicious content.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=unified+school+district+of+de+pere+jobs In PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/b382696157edc8e.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/7d7b6617ab8.pdfIn PDF document text
    • https://fifowekuvepu.weebly.com/uploads/1/3/0/7/130776735/7878700.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/lavokezajik-basakoki-tumomodabose.pdfIn PDF document text
    • https://somanenor.weebly.com/uploads/1/3/4/4/134472611/7096254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5f93e00685246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5f9003222acd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5f90e1f240b44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5f91fd82794d7.pdfIn PDF document text
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/7306375.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/kukutil_majofir_nugibeg.pdfIn PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/xoguketakipiweded.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/jamokaroxoj/exercices_orthographe_cp.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/glossary_of_legal_terms_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/folaguwodebefakos.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/tisoju.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/organik_bileiklerin_adlandrlmas.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/21177367304.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/24834443654.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/conformation_of_monosubstituted_cyclohexane.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_off00005736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5736 5240 bytes
SHA-256: f60bff8350348c158cf01f61ad254445dce8e3000dee216e9acb48c81733885d
font_01_sfnt_off000068fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68FE 10780 bytes
SHA-256: 4626816aaaacc350ae793c7fa3ecffa81e8fa7416b8ae7d0634656dce1608f0f

Open this report in the interactive analyzer, or submit your own file for analysis.