Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65fcdb11aa9c316…

MALICIOUS

PDF

54.2 KB Created: 2020-11-09 01:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dafde3da33f1b61715de5db5c5ccabce SHA-1: 2d88daeddb0422549823efb21c0484858ccb1cc3 SHA-256: b65fcdb11aa9c31639bd97c1700a396bf04454cd7eae6fe7ece3b9d272841f75
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=xtreme+no2+boost PDF link annotation
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/vofan-lubegof.pdfIn PDF document text
    • https://jadimakadafi.weebly.com/uploads/1/3/4/3/134378671/2444202.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/c941ad02-088c-4e5b-8688-7c761a525f99/kansas_city_star_fishing_report_july_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9f8576-7ac6-4f5d-9fab-52cae565a424/zemuvujijulurisawepupami.pdfIn PDF document text
    • https://mixuxikorar.files.wordpress.com/2020/11/farberware_air_fryer_manual.pdfIn PDF document text
    • https://wepigun.files.wordpress.com/2020/11/zesivi.pdfIn PDF document text
    • https://bivananoso.files.wordpress.com/2020/11/89335943961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e990bc-5b18-433c-bf05-17786a0d28b2/ancient_egypt_study_guide_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e21274-750b-4044-81ad-1b245d6e03ed/botenapugesolegi.pdfIn PDF document text
    • https://vexidip.files.wordpress.com/2020/11/51226523667.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/bogasobopivotikafafefo.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/dns_server_not_responding_after_windows_10_upgrade.pdfIn PDF document text
    • https://xoxedoxiki.files.wordpress.com/2020/11/7469939874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27376a1d-8336-4471-b510-b1f0e7c51e51/xesididivat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000835d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x835D 4508 bytes
SHA-256: fa77f6af22d18deb13387ae5b395d3dae9af586bb4208d41bf3e33758f64310c
font_01_sfnt_off00009340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9340 4836 bytes
SHA-256: fc1919b5cc94726885b8289a18b939d467f95e4b4f5eea579a0eeb3fadff5215
font_02_sfnt_off0000a39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA39A 11572 bytes
SHA-256: 6efcdc9a71230a9164caf0b64952e6c9015494bae4e7834b134212b3134ca9a3

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