Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b16b3412e73457d…

MALICIOUS

PDF

76.8 KB Created: 2021-02-03 15:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: e98d4c0f2dc6e795f57589b2a24fa5d6 SHA-1: 101686fa5d31c84c820cd7e47ab3060dd9ffc37c SHA-256: 6b16b3412e73457dddb048bfd8a7274959e3da861437f7cb5874fe241611d60a
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=runescape+temple+trekking+leveling+guide PDF link annotation
    • https://cdn.sqhk.co/lolajelor/jacLwgf/61117059696.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466172/normal_5fdf3063c3b62.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/3159751.pdfIn PDF document text
    • https://nexitikobimefa.weebly.com/uploads/1/3/0/7/130776699/7f5f1703f92819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fe9b9373470c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482216/normal_5ff7829469efe.pdfIn PDF document text
    • https://wulelosen.weebly.com/uploads/1/3/5/9/135992808/pakikejubijalasivone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493198/normal_5fc5d746319da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5fff66b87ef1e.pdfIn PDF document text
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/jaguba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_5fd0da97a75d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_6016eb8ad873b.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/vapite/71361177972.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/21609891965.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/19426519589.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_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 5524 bytes
SHA-256: b69f1669591a6297468aea74533ff956270751fc6de97f55422c14026b7c5645
font_01_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 10748 bytes
SHA-256: 75657a1c69b27907ddc8df71802c23584b8931acdca5aba212666fc1a5206bda