Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8b562b2c5ed7d9…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 03:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0587558bba3519655b6964ebb3e8bf56 SHA-1: 2b76258e9040a7032cbaa24c4e3624f621a0dfd6 SHA-256: ea8b562b2c5ed7d926f3099801846879a9597ea7d4980a17dc6fc9efcbc8ab20
106 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's purpose is to trick users into believing they are interacting with legitimate financial instructions, likely leading to a scam. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://9y.bfage.com/upload/files/20210907145000.pdf
    • https://associazionebriciole.it/public/file/88504762696.pdf
    • http://about-dogs.ru/upload/file/63141106168.pdf
    • http://geotersrl.it/file/34380875453.pdf
    • http://andrenickels.de/ckfinder/userfiles/files/gokuzewajafiwezapowikiz.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/91793745552.pdf
    • https://kaowei.tw/image/files/20210907_065128.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161317bfe94478---98850223329.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/tisukesulogolerumavipotis.pdf
    • http://tainanrup.longi.tw/uploadfiles/files/20210909_065855_9294.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/toruvogajiwoxoxupidonel.pdf
    • http://cmtdental.com/upload/ckimg/files/23340799781.pdf
    • http://pinturasoltra.com/images/slider/files/2991701879.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135de0406593---xuzewibuseboxidalexuram.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/25720845415.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1e7507fbc4ec51c6fc4fe2ee918f10af/darasu.pdf
    • http://klm-co.ru/foto/ck/files/10420424335.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/rutolerefozasamo.pdf
    • http://batiment-tunisie.com/userfiles/file/41950593049.pdf
    • https://masihpt1.com/contents/files/67938162590.pdf
    • http://malir-naterac.info/UserFiles/File/16446618350.pdf
    • http://dfanchem.com/upload/files/54564155677.pdf
    • https://producto.works/userfiles/file/worafixowunozikurufatinir.pdf
    • http://stefanourso.com/public/userfiles/file/gunekefadidifujurimaposi.pdf
    • http://mywayrtk.info/userfiles/file/49076938488.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=move+android+to+iphone+after+setup
    • 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_off0000c0e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E9 16792 bytes
font_01_sfnt_off0000d900.bin
5c193e301e95c8797f52a609ad14ad894c373d97604b87847cf0dc8a0caea5cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 10708 bytes
font_02_sfnt_off0000f186.bin
a7491b14b9761dcca0d5333f7367049d322d1c93977de38fc35b1ddf95b7516f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 17540 bytes

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