Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4bdbe0323f1029…

MALICIOUS

PDF

67.4 KB Created: 2020-11-19 02:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 47c21111a6d009769b90ce294a5689ee SHA-1: d8084845818e7fedfa32c2d046c784aea9eca7bf SHA-256: 9f4bdbe0323f102934373a713254528ad90f706e57a7e1e54cbad7e94f3173ea
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 0.9997

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/strik?utm_term=tamora+pierce+epub+collection PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f895f421d22c.pdfIn PDF document text
    • https://fugubujezowegi.weebly.com/uploads/1/3/4/5/134502495/pedowit-wekozitem-tufagovo-muvuweg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5fa5205b10b43.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/tazulasepukinuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f8cec0bda019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f9aee4a4c08e.pdfIn PDF document text
    • https://jadivamanug.weebly.com/uploads/1/3/4/8/134868371/9580802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_5f8e17f00fcd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5f900b9c117d2.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/cbab717b-5187-4587-945c-aa9bb6699b46/the_young_elites_enzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fec9b7e-3d8b-4955-b1ea-d604b743bb71/integrated_math_3_textbook_answers.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_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 4988 bytes
SHA-256: 55375a212a6f2f42aa4f95d48c5675a83ae39531e1c159cbb506b8e311cdd3fb
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 12108 bytes
SHA-256: 4fa691579f5750f34ab9637fdc666c02be75a821011ee7c14273f42651a10f03