Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbc993a82d2d90f…

MALICIOUS

PDF

67.5 KB Created: 2021-02-14 23:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4754f5fc61232b7bce17c5fef5530905 SHA-1: ae4280cdccb4c3dbb5b39c6db2dd5fa1c4e13ab1 SHA-256: 7fbc993a82d2d90f6e30aaa45818191a08195d19fdb4383870284eabc739e8e9
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/wix?keyword=north+american+biomes+worksheet PDF link annotation
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/toxovalizu-rizukafefepora-tirigofe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370762/normal_6004d94fcb0aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462980/normal_5feb80eeb4ece.pdfIn PDF document text
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/6066432.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/aristophanes_assemblywomen.pdfIn PDF document text
    • https://podinelejuwe.weebly.com/uploads/1/3/2/7/132710627/sizotosiwuwo_wixoxu_lanug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458824/normal_5ff8844684e67.pdfIn PDF document text
    • https://gotizede.weebly.com/uploads/1/3/2/6/132695714/8970187.pdfIn PDF document text
    • http://vaworudewu.iblogger.org/joxizulutataxaxefotavenug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501360/normal_600f47a195a8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386363/normal_5fdd9d523a705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5ff7f5b1b0a95.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/fofeguj/template_builder_window_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/android_9._0_samsung_c5_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/rockstar_movie_hd_pagalworld.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_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 5272 bytes
SHA-256: e7c18e9e7fe5b46eacd1ed6dca5e110a6c35f25c96f4531d84571f8a969bc2f1
font_01_sfnt_off0000dedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 10004 bytes
SHA-256: d58217e87bd2eed26ad4d8616860d402413dd3899690922ab296670a7c956a63

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