Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead4a5e67e673c2b…

MALICIOUS

PDF

77.5 KB Created: 2020-12-25 19:35:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 72010b63e2dc772e47c2aea05bdc1d42 SHA-1: 1d627ba037fea8b5f5baf54193a24cdcb57bf2a6 SHA-256: ead4a5e67e673c2b4023a38c3127239a1d328061c49401c3288570fed992c8d9
96 Risk Score

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 0.9998

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://traffset.ru/123?utm_term=lost+city+osrs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494430/normal_5fcddf07acf13.pdfIn PDF document text
    • https://cdn.sqhk.co/xejulonejo/jejJhed/how_to_get_a_girlfriend_book.pdfIn PDF document text
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/d2f64fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f883d755fce0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472775/normal_5fe5a670c4b23.pdfIn PDF document text
    • https://cdn.sqhk.co/bitubebo/HjbK5bo/74831574828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_5fd3932d61f89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f90bbf7d0a7b.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/juvuraguvutoxif/veterinary_angiology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8ad02b-05b4-4de1-be72-be57e152479f/lazufafufege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df53c927-ccf4-4ef0-aa35-efdc550f23e6/la_relation_soignant_soign_manoukian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a3a288-6acf-4093-b496-52033413533e/zefofuvixafitejijorufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2554c3a-4dd3-4cb6-be87-e529922a6eb1/57897813731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8c56f1-3caa-4a1d-b4fb-c7bc7338f6e8/pedepopajevemijirodi.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_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 4596 bytes
SHA-256: bfe59aef038ed972d3ed1be6c5a6ac17908f0bec525cbc9b3eb19d0d9e477fe8
font_01_sfnt_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 10504 bytes
SHA-256: 336df34e6dfb7ecea2ecd2d46dd26bf234db351d86c2c1c1c8c276e6fb936827