Malicious PDF — malware analysis report

Static analysis result for SHA-256 21957acf12d0b007…

MALICIOUS

PDF

51.6 KB Created: 2020-11-07 13:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 91552496639d32edf7bd9471ca1d7b73 SHA-1: dba92365aec89d3747c7f750450f172dfa650a20 SHA-256: 21957acf12d0b0076aa7f46f2482532651938b9e2e526161c39885ee105a77f2
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://trafffi.ru/123?keyword=when+did+missionaries+come+to+hawaii PDF link annotation
    • https://tevigopodasipa.weebly.com/uploads/1/3/4/6/134678542/25badf.pdfIn PDF document text
    • https://lenimupet.weebly.com/uploads/1/3/4/0/134013040/78c57079c2389.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/muxegeza/kujilet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d06bce-cb65-4bc6-887f-8ce4b3bcbe96/jiwejosizuxijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2853358c-be6e-4bed-b39f-f1858c7d4639/kamojeruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc2426e-1e58-4c2f-bf7b-6bc202d99779/nikaketenirer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390d3c44-d8bf-4f2a-af0e-ab97045060af/among_the_hidden_series.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/58613282108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24738437-beb8-47b0-9d19-abe097286df3/42936634339.pdfIn PDF document text
    • https://vakonowar.files.wordpress.com/2020/11/728202325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5500757-253b-4fac-9e25-a0b88ca659c5/fekowal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbccbad5-c23d-427d-bfa8-5f02471853e6/gumowewegetivafusiwome.pdfIn PDF document text
    • https://lusabun.files.wordpress.com/2020/11/38072893717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93941cb-519f-4893-abd3-bfdfd5bab2df/50480938195.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_off00008721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8721 5252 bytes
SHA-256: 28f3c9ccdc37db20b785dd4683c74744dc48d45059ac4d5dea49fd23a251f759
font_01_sfnt_off000098e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98E4 12768 bytes
SHA-256: eef26417ad054c43108a429795eb65b7360bba002336252ddb4b1ea2ed282efc