Malicious PDF — malware analysis report

Static analysis result for SHA-256 d021ee1a44ecc89f…

MALICIOUS

PDF

66.4 KB Created: 2020-11-18 13:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 45459a0cb53ca5b9ee125e7b2543b63d SHA-1: 6fd06818e3a9425cb7878f0f0badbf5c392b583c SHA-256: d021ee1a44ecc89f7eb0312c7310a015d7512b73200ed2c37b94313c8fb56fe5
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://traffine.ru/aws?utm_term=broadsheet+perth+jobs PDF link annotation
    • https://gimunoje.weebly.com/uploads/1/3/4/3/134344093/1589788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_5fafda2fb709c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5f8cb95c26f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_5fa45a5338140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f8af35573e1b.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/9639ba8a-b819-4b6a-81e8-3fac0e4923cd/91232853732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d86172e-47b0-499d-bbfe-47ab5ce69097/tewufijafetevimikit.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/mangakatana_dr_stone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0e343c-433e-42f5-97a3-42ce5488ca94/mijitejunoririzazet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2a0210-40d4-4735-805d-a4cda011804e/40085469186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cc2f388-0480-4412-9e85-195b7d20f309/the_american_journey_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5db66a-f5cc-4383-82b0-043851a692ad/23415288274.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_off0000c496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC496 5280 bytes
SHA-256: b809d097127f6bc41f7b10c4feb8f2bfa12ce675704a83b6a750904c77dbaf6a
font_01_sfnt_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 11540 bytes
SHA-256: b5c5e8b75b2188acf41bf671eaa209772d4172f69a097ade080a8e8f24cd4604