Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6801e1469ffc52…

MALICIOUS

PDF

68.6 KB Created: 2021-09-12 03:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f7c981dce0229b2980732bc58cc9d48 SHA-1: ea10d05f7cc2f0cd7c8db511228d3018a3a7ddfb SHA-256: ea6801e1469ffc525b19fa388ff215be4cdfcd3b6b71c757de102b7809f0a3bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing an image-only interface to trick users into interacting with a malicious link. The embedded JavaScript stream, combined with numerous external URIs, suggests an attempt to redirect the user to a malicious site for further exploitation. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ita.kru.ac.th/ckfinder/userfiles/files/9965738774.pdf In PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ed62cc955a539d8649eafbc1df896880/pepijajamupudoje.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109032214584448.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/43866490521.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/vomujisiveliwukusososuj.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/rosagabatadajexokemage.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2bcbef1d---xibovaxowepivajogixet.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/vutolik.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/ligebukitipewumozavigonuv.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/92373046084.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/sabute.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/nidujisavofamid.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/41909729834.pdfIn PDF document text
    • http://fitviewer.de/files/file/xujijoketuvozatizozus.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/zafipoxelotesupu.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/varibefixezoxoxetuwe.pdfIn PDF document text
    • http://93564497.com/userfiles/wudakopopokij.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/69884751926.pdfIn PDF document text
    • https://ienter.bg/files/28015059445.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109090934006023.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/xoziwolutileteteladem.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/gepikimibifa.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/7931152533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mobogenie+download+androidPDF 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_off0000b16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97C 14360 bytes
SHA-256: dcad56250fcbd43c6593a785700569743b2f4d535d2b546c8bd04f384e87dd0a
font_02_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 10376 bytes
SHA-256: b65026955558ac16bcc328bb1043a98b1730445c2ad739f8e08b66b1d34ae05a