Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba16ae69456b767…

MALICIOUS

PDF

93.7 KB Created: 2021-03-19 04:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8ed7369e1024c6ac974ec4e50802a74c SHA-1: dd6457edabb1dfed2c7b515b7f7f3b29bfc45d25 SHA-256: fba16ae69456b767c7f46c85d97ff26bdfd5b2d4b10975543b100a1d7fd63c72
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body and heuristics indicate it uses a lure related to 'properties of binary search tree pdf' to trick users into clicking a link. This link, 'https://mezovuduw.ru/award?keyword=properties+of+binary+search+tree+pdf', likely leads to the download of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=properties+of+binary+search+tree+pdf PDF link annotation
    • http://golden-bridge.pro/proficy_machine_edition_7.5_download7zsiq.pdfIn PDF document text
    • http://auth02mobility.com/article_analysis_worksheet_middle_schoolqmdhj.pdfIn PDF document text
    • http://mx50off.info/why_is_gdp_per_capita_more_accuratek4ngb.pdfIn PDF document text
    • http://xijafagupigor.22web.org/12877575256.pdfIn PDF document text
    • http://zoomita.fun/target_keurig_mini_black_friday_saleczt26.pdfIn PDF document text
    • http://giveaway2020.info/nimenuweminuxupawujexubeb1hy.pdfIn PDF document text
    • http://geleostone.online/mitawokomodawarbhzdk.pdfIn PDF document text
    • http://fesadivu.iblogger.org/business_card_background_templates_psd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogakusepululir.epizy.com/pozonab.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/mini_adirondack_chair_template.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/goguvaxumolesufa.pdfIn PDF document text
    • http://sevuvev.epizy.com/trane_xv95_service_manual.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_67de29f715b94222a03de0d87b54a9cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/19668576414.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/witusib.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_523a1b7598554b8894cb9f20bb9658ab.pdf?index=trueIn PDF document text
    • http://gidubivej.rf.gd/farsight_enclaves_transfer_sheet.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_a587ed9d31e54a8b9167b814421a7bea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavalukato/bunav.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_off00012f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2F 5456 bytes
SHA-256: 289dee307d52a7b671063ab43f2da8a13d7e04df7d2cbd6af1b1d89822509351
font_01_sfnt_off000141b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B2 11628 bytes
SHA-256: 300a7f7164ec1a88a3ab9fa850919848de0ef4c66e921cb506ebe148f44b5f34

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