Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb303e2881e823f…

MALICIOUS

PDF

40.0 KB Created: 2020-11-09 01:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 835c0e80c2dd36fb4a215dab761fb00e SHA-1: 2991899a79338a8c52f4228fb1a12e50130f706d SHA-256: 3bb303e2881e823f2873f23b048f67f876c99dcb0f3b890871452d6494dcac58
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://trafficel.ru/123?keyword=hms.com+middle+school PDF link annotation
    • https://niwewuvikade.weebly.com/uploads/1/3/4/6/134629185/7909489.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/7281353.pdfIn PDF document text
    • https://dedetalorisa.weebly.com/uploads/1/3/4/5/134593476/gezawuzagowidusuvub.pdfIn PDF document text
    • https://xovadodelemowuz.weebly.com/uploads/1/3/1/3/131383330/d912f3dfe1aea.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/tobojelusiwi/geology_topics_crossword_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9877f849-0f92-4fe5-ae44-73f02dbfac33/43398336270.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/penuxebamobivukizupap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ddfd60-77af-45e0-b392-4a9c779200b8/70200160865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb0e371-6171-4886-bbb6-563c52b5e4be/36163154200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf4cb93-b557-4ae1-9b28-33b176bd2ea5/spinal_cord_and_reflex_act_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb171486-3af6-4634-bec8-f20d31d081cd/99740601595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf78b7f7-ac42-4d9f-8401-280c7729dce3/jagejozubatipib.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/21471488383.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_off000060b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B6 4864 bytes
SHA-256: 984cd4dfd8550aa7e7d12d6d23f660bbe1aeada303cc0bb359e5fd02e0783ec4
font_01_sfnt_off0000711d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x711D 10056 bytes
SHA-256: a690e213cae7ddf3f3fec0c43b36226ffbccb55672fd6e7ab475ca4a24514c21