Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb86ef1c04ee822b…

MALICIOUS

PDF

71.3 KB Created: 2020-11-10 01:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11457619696acf830001536dded11e79 SHA-1: 505c1575fedc07b1457b847385951e9abfb5f362 SHA-256: eb86ef1c04ee822bc2684c951872b4720a362840d35c5e0b45252443c592a281
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL and the PDF link farm heuristic suggest the document is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=medical+term+for+incision+of+the+abdomen
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5f8cc9eed2e71.pdf
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5fa36a42a1166.pdf
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5f93c4f4590c3.pdf
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5fa41323daf9c.pdf
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f8e4d238165b.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lulodegoner.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b00a911a-d938-479e-8d28-895337596bfd/zitiwos.pdf
    • https://uploads.strikinglycdn.com/files/71cb6ca3-b664-4f02-881a-c27d2c8a3faf/79309477472.pdf
    • https://uploads.strikinglycdn.com/files/e872b69c-9f6b-4f3c-9ae7-8904fd43fb40/52183050129.pdf
    • https://uploads.strikinglycdn.com/files/252ff5b0-f08b-4df7-be2a-999671699d4f/tobolojabulu.pdf
    • https://uploads.strikinglycdn.com/files/9f4dec99-1c58-45bc-8b17-9a81ce245a6a/54901877436.pdf
    • https://uploads.strikinglycdn.com/files/486ebc5a-da90-4c07-8271-7ee304f1a9f8/senefibotozugimojelo.pdf
    • https://s3.amazonaws.com/juxatop/ratios_rates_and_proportions_worksheet.pdf
    • https://s3.amazonaws.com/nilafafakem/89659926804.pdf
    • https://s3.amazonaws.com/gotijejaj/74867940117.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/gizugoluvafazed.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf7.bin
39a6e42b4ecc29fa63abed04ad439d96529e87cc31328b5a8e59cf7a4eae3450		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 5196 bytes
font_01_sfnt_off0000dd63.bin
b0edad7ea3422e3b303d55f25c16d63d1f6019d64dd85950fa895d121e4d8fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 10672 bytes
font_02_sfnt_off000101a5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 4324 bytes

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