Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f7268e9545be37…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 13:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: e3eb34f71c01a54d101d4a9a507ffef7 SHA-1: f391f995689816efe66dfd0f44d8e2aa7c00203e SHA-256: 91f7268e9545be370db3971a35c2b65ff71cb6e2b0f472eae14d5b004ad70905
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • 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://119pump.net/d/files/43310743217.pdf In PDF document text
    • http://mywayrtk.info/userfiles/file/valuvawololiv.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/lowegu.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/71035956974.pdfIn PDF document text
    • http://3q1p.com/upload/file/210908113313837626wsa9ngujnr1y.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/nesufulaxewarazobemetev.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/luraboxawaguge.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/59070641946.pdfIn PDF document text
    • http://eventechsite.com/files/files/zovovomutolav.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/divigetoruvo.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/39500400592.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/zisofawusewuxufujibij.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/wupujeme.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/judavur.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/28578830153.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/vukagugaboged.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/zineriri.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/70721779618.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/e3qhbe36sk7tmornptbk2804v2/41795323644.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/25993897268.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/8222929824.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161395f557c8e3---44363294377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=modelo+pedagogico+conductista+pdfPDF 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_off0000d3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 10788 bytes
SHA-256: 38648e1e29e08246f82f81a5040c37f824bf492e8827066edb2e3a965a9cd0fe
font_02_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 18300 bytes
SHA-256: 9ab2a372a93c9af2c06231ca70d8ea4609cae261be8c6db602744bdf499b6f70

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