Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42c49bbf5b2e20c…

MALICIOUS

PDF

40.9 KB Created: 2020-11-09 12:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b8f0e3eb8f320c5bfcf9b5b77116d1e9 SHA-1: 8a2159c8cf285c20315b125f38d50b51434b5024 SHA-256: d42c49bbf5b2e20ca83eeba8f37dce85ab4e0a150f67bdb824358d7cc89bc532
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure.

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://trafffi.ru/aws?keyword=metric+conversions+chart+for+kids PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5f88cbd7ecf41.pdfIn PDF document text
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/5747599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f89cd6c5022b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5f9f99e105fca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f96b573a282a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_5fa1947bd4e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5fa880f5b2fc3.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/0388f817-1610-4a39-9231-b834888be0bb/kagewijovapodanev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12bf7af-cef6-4f66-a75d-7e794280135a/lutigof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f7003b-1941-4ea5-808e-23d282bbde72/80975566936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48851ea-41d3-47d3-a886-b8c4973128f6/damufofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83e4f63-abf0-4de6-b2d5-7ff9266a68ce/fallout_4_change_companion_hair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363a5d16-cb22-4ea6-91f6-51d08ef660f5/swtor_kira_gift_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eaed208-1a32-480f-bb75-785ac70b123d/appsense_environment_manager_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98543500-f1a5-4ef6-a373-26d019c171cc/zigexafepopomitowadu.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_off000062eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EB 5204 bytes
SHA-256: d7fefd9044f076c25bc0d30cb238e5484a2461168844f4d9f1ca22f8159c2138
font_01_sfnt_off000074b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B1 10072 bytes
SHA-256: 1be280daf855312be2d5e8ff93619859158d5762353d443339c84c97207c5c30

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