Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df0a538be042b23…

MALICIOUS

PDF

39.1 KB Created: 2020-11-08 14:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 387782a397d447fdae819fc04a6eee93 SHA-1: d50d1add9b45b98125777d88ec9cc0026f0ae833 SHA-256: 5df0a538be042b239b8b2ab3567e0cc2727d8d731a1edb2c898afdc4ad7d20f1
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://trafftec.ru/123?keyword=boat+trailer+post+guide+covers PDF link annotation
    • https://revokaraso.weebly.com/uploads/1/3/4/3/134320841/tarexuvabiz-minogijega.pdfIn PDF document text
    • https://rokejowavati.weebly.com/uploads/1/3/4/2/134265467/aac728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f878945503a2.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/petuzutemixuvod/is_first_lady_capitalized_in_ap_style.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/ipa_symbols_and_sounds.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/tezupuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c5eaad-1eec-4112-bd6b-bf77b3d3cff1/tired_swimmer_case_study_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fced8941-ed2c-437e-8f33-70948b2b1b81/badiwomola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d665f119-b2c1-4983-a39a-e5514427f705/manual_de_urgencias_en_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/jobabizomoximonubiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03f025e-a187-4bcd-bd74-d696fade8729/26733372737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1d81b2-ae72-4836-9852-25ec77030479/wurst_minecraft_1.14.3.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_off00005d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D27 5348 bytes
SHA-256: f95bb5406d5704e3c4ff974563e837f4b3c9050dbc78ea56f56abf7cbc5dec02
font_01_sfnt_off00006f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6B 9556 bytes
SHA-256: 16d436f122938326b7ee109e1a8d73aa1286e1a3bd673ae7cde79ec7527ca97a