Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced91901ed0c53a8…

MALICIOUS

PDF

72.4 KB Created: 2021-02-24 09:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 832afb340a10268def2b0481a38a4bba SHA-1: 1704cf1a4340ff8c8870e131c3f92e7187346382 SHA-256: ced91901ed0c53a80d860ad38babfa021a688ae7a1e0ba2f91855d89578c2dae
254 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
  • 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://crophysi.ru/wix?keyword=microsoft+wireless+keyboard+1000+driver In PDF document text
    • https://static.s123-cdn-static.com/uploads/4467036/normal_5fe4b8e982888.pdfIn PDF document text
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/dedikifugamuna.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/8JggFha/89130579823.pdfIn PDF document text
    • https://cdn.sqhk.co/jebixusugak/Vjbzrha/firabi.pdfIn PDF document text
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/4a82cb6a.pdfIn PDF document text
    • https://saditifoba.weebly.com/uploads/1/3/5/3/135325123/1505391.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/bihGUif/bida_at_kontrabida_meaning_in_english.pdfIn PDF document text
    • https://sifavebizibi.weebly.com/uploads/1/3/4/0/134040704/nawakaponanaja.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/866b25222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_601b28c7cd761.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/gurupixabogivaz/55234838226.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/mogolerutolewadidavi.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/81453145599.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/48282569912.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/lerivezi.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/fuzofubidikovesepipaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/apartment_rental_form_template.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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 5672 bytes
SHA-256: 1b86c6dd6c5bd06f08012c869d4cf03aade58c4b011054d92c1641e835161fab
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 10260 bytes
SHA-256: 019978b95227b684a9e3635fa50f3d68cd0a4dcb7ff0e01dfaa39bd5915609be

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