Malicious PDF — malware analysis report

Static analysis result for SHA-256 74eae54c464848a1…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 22:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cecd3056c8b7f7781d17174ce7c05d02 SHA-1: 5eb62d8052906f668b4ea44789b1e12f75bb8a71 SHA-256: 74eae54c464848a1c6fdbdf9296903a5403fac6094aa1a7cf97e0ff7a8054425
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://ermolino.mebel18.com/uploads/files/gabukedilevozazim.pdf
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/vabipojemid.pdf
    • https://lmbri.com/WYSIWYGImage/file/juvavireworisatigi.pdf
    • https://travelworld.ro/userfiles/file/zofofedurixubusovak.pdf
    • http://kindergartenhelden.at/upload/file/7258875835.pdf
    • https://manajrgvaaradhi.com/cms-uploads/files/73264973476.pdf
    • https://gotoko.com/cmsv2/upload/files/lovatoxubidimew.pdf
    • http://nawoo.net/userData/board/file/bamakanajuromamudutuvuv.pdf
    • https://rafaela-motores.com/userfiles/file/51852489411.pdf
    • https://bunianco.com/other_files/File/vusab.pdf
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/baxem.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143a4dd5580d---72633731309.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/69795662524.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/66747710015.pdf
    • http://mrybalko.ru/files/60843574420.pdf
    • https://drticket.ir/basefile/drtiketcom/files/rexavo.pdf
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/tedafijij.pdf
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/55627517655.pdf
    • http://decaiyun.com/upload/file/210912052909708846p35wgjdufm27.pdf
    • http://insei.eu/userfiles/files/7974248835.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/76773264662.pdf
    • https://geloracinta.com/contents/files/51864406553.pdf
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/kaxupesepiditagim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=realidades+2+workbook+pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/35170695037.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c23b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC23B 16792 bytes
font_01_sfnt_off0000da52.bin
7e65d06abcdb513d3ea29fbc98ffacb393ef5a9b37d581c6f572ee4084a53b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 10772 bytes
font_02_sfnt_off0000f313.bin
8346e36827af5905dc55fd44c92452210ebae1fec814956f32c494a15d45ecf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 17440 bytes

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