Malicious PDF — malware analysis report

Static analysis result for SHA-256 88100120687aeb5e…

MALICIOUS

PDF

54.0 KB Created: 2021-10-02 12:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: da8353aadf94874a6cd59a17d9b2daf0 SHA-1: 40518b2184e2cb94b6b1741fb832683b5a929f4a SHA-256: 88100120687aeb5eb90dd53ecb566d50c0437096b43c240cb37544e56d66ee8c
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many hosted on potentially disposable domains, suggests a phishing or credential harvesting attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8059

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.
  • 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
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/91ce98e1322261b7fd6c6b998706e404/59483689543.pdf In PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/55476011249.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/wizegolo.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/laburedir.pdfIn PDF document text
    • http://showdoimovel.com/files/files/xomagefoxomomorodafidor.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/256029249.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/dunokebuvuzuxaweju.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/tijososa.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/wobojerobamokusib.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/62464484039.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/12611405674.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/it4s037qgmvr8sr9gco391f7lt/20184721846.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/vesukiripoziwedobemoji.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/kujorovuti.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/65424836673.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/lazefox.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/2885879892.pdfIn PDF document text
    • http://flexa.cz/docs/file/buxuwik.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/63707372764.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20211001041330.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/nitesorepigukolitebiwati.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/58338518340.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/koxumufibeburalov.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/dusovaxuxawoxuvilisaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+thingyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 10284 bytes
SHA-256: c06d453d06efb5e75f1b91518e5592706f6142233254cc951a877c1e5aedbdae

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