Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f08907d52741d50…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 04:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: e277592926a12287cb17999b455262d2 SHA-1: eee4582d503900686913db5802d30cefbfefd12e SHA-256: 2f08907d52741d501b7cf165b80d7b1834d99f7ec780df09c74ee920269501d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/91a5370e4dff0b39994df95b7778232d/31816893768.pdf In PDF document text
    • http://opusincertum.it/userfiles/files/86650338632.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/75391562011.pdfIn PDF document text
    • http://ewtch.com/upload/files/45129108338.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/dagaminumisesiwefasef.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/19155262785.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/wufufakunofin.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/65131951849.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/lusexif.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/60586814895.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/vomamadukolitemebexi.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/buwawinuxabelarowuduxeb.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/fagorak.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/zugakinur.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vqc3vvvs0u7bq6en7nlstap6g2/79145570162.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/44713208969.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/xivexubomogexiganuzor.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/jugemugijozojezaleko.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210910_9BADAD9E2733C5E1.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/41718923621.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/wezaburezurugat.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/61237376892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+long+can+u+leave+raw+chicken+outPDF 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_off0000c1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AF 10676 bytes
SHA-256: 9c0fbf415c9c51cd3f8f5d80c99ca4d2a81877e579af9d91671d23f4b80e02a5
font_01_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 16272 bytes
SHA-256: 6a301faec69585fdd1dd126e5ea6b72ab25f8b53fc775437e16443c25d824e62
font_02_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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