Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e3b6558af55f4e…

MALICIOUS

PDF

42.2 KB Created: 2020-10-18 05:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 21a7079fa22a727b54ca422e08a51590 SHA-1: e35cab57f87d5472998606b68f513ac0f1f24364 SHA-256: 57e3b6558af55f4e6b3108cffcbb9a0138037487bed18990af0282bf69693fe3
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?keyword=practice+test+4+sat+pdf In PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/a37e269a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f8b3c05a8d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f88aa006c218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f8aeff429c83.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rotesojelunemiroto.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/a8892a2.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/f97d93e3-ca52-46d8-9699-5824bacad210/dozitofemezutozasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb91fb90-9570-4767-9d24-eb753ae2c389/20548538819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42539731-ffb3-43a8-8a71-1bc28697eb89/90368243311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c90bbcc-28bf-4742-a5f9-72d8a5e3b271/8826168434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/493291c9-aa0f-4379-94e5-c9ca3b7700e3/lupureg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c65b5eb-83f9-4efc-813c-4731dd88dbb4/80919466735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3387e49-e4bc-4289-bf2f-6b2697b58f11/wuxekuwopabudinepura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f71850-f44b-4108-bd57-4a413e954d2b/fugamosetajidekerutenuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b767bd2-3fb9-4415-b714-d9b9e01c2a1f/vadituruku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0f20cf-7ade-45d2-bacd-b18589e6476f/kurinetos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb98be38-a8bf-4377-9efd-8c0474d51212/dixuviwipudefevoveb.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_off00006753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6753 5208 bytes
SHA-256: 10962a8207a1447a7b2fa1e0148b078723a68b0fb65533233caa91b0a8842fbb
font_01_sfnt_off00007919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7919 10112 bytes
SHA-256: b40d7907ac3a81aa477b3bb7f49935a63e54bf12a35f9da1bc9b667b955b3cb3

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