Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3da9075f8e3e76b…

MALICIOUS

PDF

71.7 KB Created: 2021-02-07 15:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: ececd65f39341d5a711d127dbcbd7219 SHA-1: a664fdffe91f949b03a559765c5e233d7b4c888f SHA-256: a3da9075f8e3e76b3a1b016f2ae266766a65fa2de7b99d7ef5df4e7274329d68
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=decolonize+your+diet+ebook PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369190/normal_5ff220123a271.pdfIn PDF document text
    • https://cdn.sqhk.co/posuwumujome/1HimheS/nedevibaxusawupe.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/misajiroduxaz_jemufobuvod_dususa.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/jjgCgjr/100_sudoku_medium.pdfIn PDF document text
    • https://cdn.sqhk.co/fidakasari/hCIDaUT/36556515015.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/mupukesunobaga/sejoxodanowodotusesiki.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/authentication_protocols.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/xiseb.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/advantages_of_balance_sheet_and_income_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/apptrailers_apk_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/elder_scrolls_online_bloodroot_forge_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/beledubebagotudadu.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/mobil_dte_24_msds_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/49267183009.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/chrome_version_70.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_off0000dd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 4900 bytes
SHA-256: 3777e327093af3a78ba088fb546ecb6b0f72d37f079117da24c3961b9c1d34eb
font_01_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 10516 bytes
SHA-256: 55f1e71be44322b816267e0a0977c2a4891cc4ae3911d082584f834353a27a40