Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac141d0a601d8370…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 17:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0073a7492288961f0312e519328fd1f0 SHA-1: 873c08e1a19ad87b1b2dc0f1978a6d1a73a3b344 SHA-256: ac141d0a601d8370f775be19f72331352f803c3da5b93f5517189910780ec8b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of links to various PDF files hosted on different domains, many of which are likely disposable, indicating a link farm for SEO or phishing purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and numerous external links point towards a malicious workflow designed to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://ladyqueen.it/userfiles/files/26404576038.pdf In PDF document text
    • https://artgreen.vn/attachment/files/kerawogufofivonol.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/lijino.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/32237324932.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/kajov.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/korelanabusasexevuxet.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/2259265503.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/gakodajelafetikes.pdfIn PDF document text
    • https://gangnampools.com/contents/files/kanifepaledarasagulevedam.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/molufowokazimaxeza.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/falujavopulopitotixoja.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/saruv.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210907_0BD7FE42B747391E.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/zezozo.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/40849984948.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/tixijowirol.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/28108409969.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/84545709735.pdfIn PDF document text
    • https://lordoptika.hu/files/files/34111913651.pdfIn PDF document text
    • https://ibextrail.com/editor-images/giwotunebovazoxejev.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tedepo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161357a3f1ae7c---derezuganasus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=chota+bheem+race+game+mod+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 17000 bytes
SHA-256: 8c72f61f69b7a58972d773f875790aad2490f152b946b9e5bb9d07cc92b57ce4
font_01_sfnt_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 10816 bytes
SHA-256: bb19ca2b908a790d3a0d7a0f37f81e4d5f0ea82ee8ec8f5b0802e398889b0b84

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