Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bee3aff4e34dbe…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 21:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2519f7f5d23d0be231d6504c536a2888 SHA-1: 3e1b633dac5a39386b2348457ac88ee920f3bdd6 SHA-256: 75bee3aff4e34dbe9420c4c688066b80a4853e7721c0bb92e611a3687e8a53a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely part of a scheme to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lixupeng.com/uploads/files/76930629616.pdf In PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/39159603852.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/bulumabaxanise.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/zadazidin.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/bamodemotufifat.pdfIn PDF document text
    • http://fpole.ru/sadm_files/68261496948.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/wesexuvevuvajajarolewe.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/periwomutotigipiboxe.pdfIn PDF document text
    • http://co-mit.com/uploads/files/54362980995.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/domipofimenulebudor.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/90355797587.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090619584073499.pdfIn PDF document text
    • https://alpinashop.bg/files/26020616964.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/jikilegiliri.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/bisumi.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/89644233700.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/80255040141.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bcefa29d869c66aa4eaf0bc3f6400b94/wedokipivuwimebuvakozijav.pdfIn PDF document text
    • http://bastola.org/userfiles/file/vebedo.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/23993308000.pdfIn PDF document text
    • https://thepainter.asia/upload/files/xumeliserezel.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/29030033110.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f5ba3300---51977719612.pdfIn PDF document text
    • http://cochemical.com/upload/files/74612102195.pdfIn PDF document text
    • https://onlinendttraining.net/files/57628493661.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/refodovideba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=outliers+free+ebookPDF 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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 10300 bytes
SHA-256: be041811e4bcc5f69e4c1c3d01fcea86e7c71036a0303277644ac08fb398149d
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 18172 bytes
SHA-256: 26a43eea1b3a1913854482a8977c54496d564603c67d31e0ee8a60c019b1040f
font_02_sfnt_off00012963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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