Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fcd5c3c3386681…

MALICIOUS

PDF

69.2 KB Created: 2021-02-22 20:35:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 34788e191219d3f4a5ead8a893f1ec3b SHA-1: c04ee7a5bc734ecd8f27d47574b70e44e40d734c SHA-256: 90fcd5c3c3386681dce4427860750bf4b2a16d7b61807b192af8f2a6341b7a65
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/123?utm_term=how+to+find+common+ratio+of+geometric+sequence PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472768/normal_5fc7e6594bae5.pdfIn PDF document text
    • http://aicberg.net/forklift_training_online_testhvc92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_600f5be3991a6.pdfIn PDF document text
    • https://cdn.sqhk.co/tuforalogidu/RPBjfjg/48471333030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_601644e4f357a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477387/normal_5fe3324db101f.pdfIn PDF document text
    • http://hookup757.fun/xulimenuvepaak48a.pdfIn PDF document text
    • http://agentsoft.space/apk_afterlight_2_full_packdvnun.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/fezad-filitipeto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_6012a3032b0d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483610/normal_5fe5da41e9715.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/zexozavo/74991921486.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/78278650683.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/beverage_processing_technology.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/46745687759.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_off0000cbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 5488 bytes
SHA-256: 6bbee977fcbbaf4dbebfb5c8658f5351b1f0c5ad3a88b6914bb2939eac72d9c2
font_01_sfnt_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 11684 bytes
SHA-256: 704933ca21989a5a4c7e748ad7c0e9128df6af8ec2b555bb3090cee45262ad05