Malicious PDF — malware analysis report

Static analysis result for SHA-256 093876b5afafd8d2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 16:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 059a4c99608db43e353ef084c46a2217 SHA-1: 09a9172c600840001b434cbb4e190d4988a8dc95 SHA-256: 093876b5afafd8d245cbfd34a707566ea501347ebafe185a394ab52c1f849384
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the presence of many unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://plymouth-logs.co.uk/ckfinder/userfiles/files/67578209748.pdf In PDF document text
    • http://myphammonly.com/luutru/files/fexupibozeniw.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/31301451372.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161318d036321b---xegawezinaganogozokafoze.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/nekonidotilepagalomefe.pdfIn PDF document text
    • https://path.mn/userfiles/files/58163343088.pdfIn PDF document text
    • https://windsbs.biz/files/file/95603635046.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109121402439989.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/milulosuwilezowasisi.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/62648182868.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136508ab13ff---jivifexekepajimuritewamam.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/60702777139.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109161026481043.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/xokox.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/57430303277.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/vezulasonoti.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/53575218726.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/povaxosuxizigik.pdfIn PDF document text
    • http://geose.ru/userfiles/file/warokosofibitej.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/83093873284.pdfIn PDF document text
    • https://vitanov.rs/files/vubemabobarasenatoj.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/58527994937.pdfIn PDF document text
    • https://wmu24.ru/media/file/mufiramajemilulipa.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210913090707.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fedeveruwixux.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/72903242377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bit+trip+runner+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_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 17592 bytes
SHA-256: 74965e5720a434700a72c726689324b064bf04097cb043ba34a101ad0529ba86
font_01_sfnt_off000102e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 10156 bytes
SHA-256: 54c1af25afc6c26fd011ab7614879ce100ffe8590b4e2677a005e44a6439eaf2
font_02_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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