Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfcd788a9ccb844…

MALICIOUS

PDF

74.8 KB Created: 2021-06-02 14:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3e9998e46da2398314173420e9ab8deb SHA-1: 4b9a2be65873522e56d0dfb4da5065784ddcb804 SHA-256: 4cfcd788a9ccb84457307ea74d41fe62d16ce0c460529ff989644e3135e3f475
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://archism.ru/pbw?utm_term=netflix+explained+the+world%2527s+water+crisis+worksheet PDF link annotation
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/befuguminazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5fcef478cf9f6.pdfIn PDF document text
    • https://pebolaxakaz.weebly.com/uploads/1/3/4/3/134349421/4545647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444885/normal_606a3d9a814d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502236/normal_5fe30eecb3f0e.pdfIn PDF document text
    • https://puvedevedumu.weebly.com/uploads/1/3/1/4/131406841/nepab-koxipujenejider.pdfIn PDF document text
    • https://pelifofenap.weebly.com/uploads/1/3/3/9/133997555/vebate-kajanuzupafa-takelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_60152c0575abb.pdfIn PDF document text
    • https://xumiwuwazugeri.weebly.com/uploads/1/3/4/4/134444831/suzaravezedit-xelidupisilopop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_601754846b2ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_6036a732ce44c.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
    • http://lugozamuxika.pbworks.com/w/file/fetch/144419124/zogiborotigapafosa.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144423945/ps3_gta_5_cheats_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a821e08-2060-4677-a044-f3dabebbf44f/38273903262.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/gufegejeses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d48445-5236-484a-8795-049540ec84ad/40038121147.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_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 5256 bytes
SHA-256: 0abd7777c1f40a31981becd1324acba6ef32013f0af21cbde9dde3c698da7595
font_01_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 10720 bytes
SHA-256: b8a4273063c0c7cc807e9a705b587867cd4b3b17d19d268f8f199406209de1fb
font_02_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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