Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1811ecb6f4f7284…

MALICIOUS

PDF

42.6 KB Created: 2020-11-07 02:59:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 00713b193167bbf9843d5c8373cbea56 SHA-1: 2b10b8e2edfa293c4dc8bb9d275e0db42d615442 SHA-256: b1811ecb6f4f7284a751dc93a35f54db628f73cb7cb4401b3703b58fc1f74229
136 Risk Score

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.
  • 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://trafffi.ru/123?keyword=cc+winn+high+school+football PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8cf66aed984.pdfIn PDF document text
    • https://kenawogerawe.weebly.com/uploads/1/3/4/5/134593039/genolamatome.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/zaruba.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/sufuzodu.pdfIn PDF document text
    • https://ramojiri.weebly.com/uploads/1/3/4/4/134443871/turofexavinof.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/felasorarabipis/94701795661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e66255-377e-4170-b88c-925e0fde2bff/14754474175.pdfIn PDF document text
    • https://s3.amazonaws.com/vibove/durban_south_africa_latitude.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/rudufujasemuwekasevi.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/why_was_the_pail_pale_punchline.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/91029017049.pdfIn PDF document text
    • https://junevip.files.wordpress.com/2020/11/diablo_2_annihilus_guide.pdfIn PDF document text
    • https://dowuwiridewe.files.wordpress.com/2020/11/samomivapabaxitaba.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/kiguxonevuvimi.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_off0000699b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x699B 5184 bytes
SHA-256: 7a683c9319f8f52826b1b4abd70f7f5df96271bffb26fee81689dec63c59fddd
font_01_sfnt_off00007b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5B 10068 bytes
SHA-256: 4cf90e5827fc9d570adca1a15dd5689d6e36724e8a043eb86b24684674306bd6