Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8151cc5a39833ac…

MALICIOUS

PDF

42.9 KB Created: 2020-11-08 01:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 5e5360e7992ac6483f7ecfa2c68e24c5 SHA-1: 450bbe8b310f2e8ac123509a74747ebc6c615605 SHA-256: e8151cc5a39833ac6a53a5d2d28a41ced40bf20c43ba2bfbd718a4a25ee0c094
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://traffset.ru/aws?keyword=budget+planner+2020+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f870c924fba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451208/normal_5fa35cf294f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415525/normal_5f9d2d856b3dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5f922a905a3eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5fa252af4f66e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_5f97832d8242e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_5fa2191152173.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/leguvefu/define_behavioral_approach.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/canon_canoscan_4200f_service_manual.pdfIn PDF document text
    • https://nerukubukob.files.wordpress.com/2020/11/lezyne_macro_drive_1300xl_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d73496d7-e1e2-4d63-a7ff-37434e1d1bd7/11787901475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a26c203-47ed-4251-8298-dbd75a25157a/midlothian_library_il.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_off000067fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67FB 5424 bytes
SHA-256: 538cad5d6f871626dc38794bbd0f4cfa21938385ada5ab5873fcd43e0ab66749
font_01_sfnt_off00007a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5A 11072 bytes
SHA-256: 2e5657cfc11c8d92105b83879893b10ce0bb2630ba714a576ef198a03d1acf9c