Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a7c40e051c2dce…

MALICIOUS

PDF

62.2 KB Created: 2020-11-07 15:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ed5678ad56364782f2863bc3afa0bc54 SHA-1: 148461c6b28c267f3b6a07a32ee6c0eef4ffa4ea SHA-256: 43a7c40e051c2dcea1a0490f7a40ce049b484ca3aec5cf744ab6e307f6200f99
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 1.0000

Heuristics 4

  • 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.
  • 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://trafffi.ru/123?keyword=potencial+electrico+en+un+punto PDF link annotation
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/6718811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446647/normal_5f9eba85b5e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_5fa414f41259f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_5f8f9bbe24c2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5f983b6034098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5f9a9a0cbe3ea.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/wutezigojuxi/exporting_with_bleed_indesign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/346439aa-380e-4a6e-8cd5-aa167aeb52fb/pokemon_fusion_generation_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/votabidoxije.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/6279687673.pdfIn PDF document text
    • https://xuviwobetar.files.wordpress.com/2020/11/pakosolekezamifofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d22044-999d-4ed0-a2ee-af0df774be21/73151882466.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/85250286794.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/bumifusuzege.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000098a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98A5 4748 bytes
SHA-256: 35df0458f90a002b32555ce9c50c33fa9927ec4a42f453d3b0049e8cd7b018c1
font_01_sfnt_off0000a8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8DA 13280 bytes
SHA-256: 4c72b9255e8cfafaeec9e4508ca3739ae54c302735c2d04964ff0373ea6919ac
font_02_sfnt_off0000d46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 16188 bytes
SHA-256: aa4ffc76ffca5f5075956df421d69008c6b21628bd6bd238d4d6d680c89c007e

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