Malicious PDF — malware analysis report

Static analysis result for SHA-256 533ab9a6a990d87d…

MALICIOUS

PDF

68.5 KB Created: 2021-02-15 09:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 5a875c63c0231914197c6751af69a23b SHA-1: f24de3e10a93a17d97dcf5cd9c0e049b4ae9c4a0 SHA-256: 533ab9a6a990d87d9a7b9b1e2123000357c9e5961a8a374dbcef1bf402a5c1ca
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/123?utm_term=sound+of+music+video+worksheet PDF link annotation
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/202096.pdfIn PDF document text
    • https://xobiduri.weebly.com/uploads/1/3/1/4/131437628/rasefewalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_600d84eca94a8.pdfIn PDF document text
    • https://vojonabof.weebly.com/uploads/1/3/1/3/131383251/f87a9fa3eb9dcae.pdfIn PDF document text
    • https://puxorubawi.weebly.com/uploads/1/3/5/3/135349856/1fa6b2212f.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/zhjqShe/97831723705.pdfIn PDF document text
    • https://vusukiziroge.weebly.com/uploads/1/3/0/9/130969505/4929f.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/murudute/blank_face_sheets_for_makeup.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/game_capsa_susun_cheat.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/preparation_of_haloalkanes.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/borafuxizadak.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/gobaturusamerug.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/classifying_matter_worksheet_physical_science.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/the_bostonians_henry_james.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/snare_drum_eq_cheat_sheet.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_off0000cf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF90 5340 bytes
SHA-256: 3c0fa8ab0a3bd75df9fbd0a743456d16140d452d61f82176154985dbd84a31e9
font_01_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10436 bytes
SHA-256: cc8e60c3b42b2d798b2897661c7043bdd32cd029cfb4c9a1500897ada1d9bfc4

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