Malicious PDF — malware analysis report

Static analysis result for SHA-256 572a86911709e4c3…

MALICIOUS

PDF

45.7 KB Created: 2020-11-08 17:10:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 57990263671ab72272dd50dda492bb4b SHA-1: 92a7eae6ee9e7edbb7b384625c621dc20a5f577b SHA-256: 572a86911709e4c33fb3418f2333e395c819f7b118142bf596aa2ddb90f9eedc
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://trafffe.ru/123?keyword=penalty+for+twisting+insurance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f8de7232448b.pdfIn PDF document text
    • https://nagilozumovamag.weebly.com/uploads/1/3/4/3/134317868/vutenowabujik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f871879df333.pdfIn PDF document text
    • https://wuwawibef.weebly.com/uploads/1/3/4/6/134608234/0bd3617b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_5fa0a06178e64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5fa2a2c48a8d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f91dea4a9260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f8c0e9ba629d.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/8bf78d620821.pdfIn PDF document text
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/e45ea70e256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f875e6e5d06d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5f95729da84d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462688/normal_5fa1e30b56efb.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/valedakivoxi.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://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_off000067d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D6 5128 bytes
SHA-256: 29fbaafbac0eba2421575b32cb0463fcf232e137734783917b294da9dba65d7d
font_01_sfnt_off0000796d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x796D 10196 bytes
SHA-256: 99fa53c57e9cb351bef880971c90db0c06bd09f8c97906d7f4f76a4cbb9b23f9
font_02_sfnt_off00009c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C57 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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