Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da0c5f4e6a10e85…

MALICIOUS

PDF

32.8 KB Created: 2020-11-05 23:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 31cdb227fbb1107b9ac111bebc3c7bf8 SHA-1: 153eee0d8d085f8d07b220a089bdda4571ffdfdf SHA-256: 7da0c5f4e6a10e85e81e56ac95d81e8ea8168f1e310205666a702b352c834506
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 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://traffset.ru/strik?keyword=chocolate+cell+phone PDF link annotation
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/bodajetosason-bipejugibelumar-dupatiror-zabupuzuta.pdfIn PDF document text
    • https://motadali.weebly.com/uploads/1/3/4/3/134368257/misigipevebu_burafirol_zesivuda_duwowonog.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/zizijix-waditivizun-pabunu.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/sosuzukegejuxipom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b44a6c18-005d-498a-a65a-6712ab3cdd32/98897078808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0310517-6ecd-4cc6-a8f9-ad8c72209c57/aprender_calculo_diferencial_desde_cero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/502f3c78-91e5-4e55-9735-1f7caf7285f0/kinujapegasitirap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978bde89-9a77-4ad1-b7e9-309260ec9405/36612313791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d58dced-bb9f-42ae-b540-3af0629c3573/zajefapebuverapigixiwaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/constraint_vs_restraint_dod.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/swain_guide_s9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0ec281-37aa-431c-94df-fc1b726208fd/st_marys_net_ranking.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_off00004432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4432 4652 bytes
SHA-256: 2104acd964d3c2afa8fc8caa7bacc8b6edcf7a1d63f75b6a980390fb8682c81d
font_01_sfnt_off00005400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5400 10256 bytes
SHA-256: 45bf688f2417c8f3bdc387ee9b5e234bb55c0591ba4cf38d97f0a7244e0dc660