Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d5847d9ee49602…

MALICIOUS

PDF

65.4 KB Created: 2020-11-08 11:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2b45de5cfd84020346f4e4d54cf72c74 SHA-1: 79231141706b5ee624ddd449c552c7c78ca0bf89 SHA-256: 87d5847d9ee49602cdb17468caef783201aba5ef649bc2f72d1e04fe32ee204c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a significant number pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://traffset.ru/123?keyword=poe+izaro+guide', is flagged as suspicious. The document body, though heavily obfuscated, contains this same URL, indicating it's a primary target for redirection. The ML classifier also strongly flagged this PDF as malicious.

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/123?keyword=poe+izaro+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411917/normal_5fa1bdc87c757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5fa6505e75d2e.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/186aa6b8-a466-4054-a09d-7a6bbadc80b9/pinamomivalubofe.pdfIn PDF document text
    • https://davitiruwax.files.wordpress.com/2020/11/12909665365.pdfIn PDF document text
    • https://rigimep.files.wordpress.com/2020/11/99574351036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94dfbda-102a-4faf-b74f-81c2b26b0c53/tafozadibowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533badb8-111b-4f66-a889-be125473a249/10080162030.pdfIn PDF document text
    • https://lojopuwu.files.wordpress.com/2020/11/deliberate_risk_assessment_worksheet_for_prt_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766a5a16-a11a-476f-a30b-60e7c73ee475/vibemaxamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3732320-6fdd-4392-9fd1-38e208087084/y_nghia_ten_goi.pdfIn PDF document text
    • https://goresab.files.wordpress.com/2020/11/tawubide.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/strength_of_materials_objective_type_questions_download.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_off0000c3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C9 4832 bytes
SHA-256: 6337c3e9b04c86827724b213ba38a8ee53cfdb4615fa049a28b018e083b3cbe4
font_01_sfnt_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 10796 bytes
SHA-256: a6f3091496d848d9875817f8f594a83b7710bd261ca80f26dbab2d2ac40b9c1d