Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f54f1d7b84ec42…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 12:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7444a29f5fcaa67950f402a99bb74ed8 SHA-1: 7b385e81a6a05a96560111a9f2b622d705d3d213 SHA-256: e9f54f1d7b84ec425abf24e7bdb6687ce5e51c9ae0190e8b0b641716e77a96db
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, reinforcing the phishing or scam nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://uptownfallschurch.com/uploads/files/86949640646.pdf In PDF document text
    • http://dreesmann-foto.de/userfiles/file/65042199220.pdfIn PDF document text
    • http://egitara.com/upfiles/files/5158261615.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/50336502304.pdfIn PDF document text
    • http://dgjst.com/upfile/file/35665195061.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/dalofafekot.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/34433114685.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c036cd362b---laxugimezug.pdfIn PDF document text
    • https://sanidom.pl/img/file/wufebuvotafe.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/magebubobubusosuguzubevo.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/rijadexexezojegaxuniv.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83373337483.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/92060375789.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wexujojafasedidivuse.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-8/20210908024659489231.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/91936538422.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16317301699873.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140a11bbcd43---kovuvevuxuduvipexugi.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/16707827618.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/75461237652.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/piposaze.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/41916941129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+take+off+safe+mode+on+android+tabletPDF 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_off0000d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 17300 bytes
SHA-256: f0dd0670fec91e1bf256a77f608ced59d5d82bbef85a5afd0a923b85ce80029f
font_01_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 10824 bytes
SHA-256: a32bbd159380f0bc2372dcccf1d66f51a1b3a2ff3a035a6e84ceed15d3712696
font_02_sfnt_off0001179d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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