Malicious PDF — malware analysis report

Static analysis result for SHA-256 b661846099b7513c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 22:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23f4b3d3bc52f78bcfd9d6d289c2c0ce SHA-1: 5cf9da7d737261fa4e3d063a8ed4c7f56949caf7 SHA-256: b661846099b7513c65cdb740e6834fa795d5b27a10393e3beb8128b197782728
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=spin+for+cash+mod+apk PDF link annotation
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/81525483848.pdfIn PDF document text
    • https://samudra99.com/contents/files/6906975802.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/98148797756.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/83159333200.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/59601608230.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/tokusuzewobibexo.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/90999993352.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/42050749656.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/tikuvekula.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/30770938967.pdfIn PDF document text
    • http://mobil-tech.com/files/23829472688.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/68314010430.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/wuxujas.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/35427297421.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91914f978---wizajeredoni.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/zatotujezav.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/20572190068.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/xirifowonoz.pdfIn PDF document text
    • https://akemi.ro/hirek/file/36402108827.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/96406077188.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/18156315343.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/mizazumeragi.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78036990812.pdfIn PDF document text
    • 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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 10776 bytes
SHA-256: 4fa6d165dd92479fb0cd690b2bc3d85c4ecaa7d1ea42ed1f704137dea1e7ffff
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 19288 bytes
SHA-256: 06f6e08294e6713de7924fd03d164caa0669cc40f11915a8be442e8c8c10ef59

Open this report in the interactive analyzer, or submit your own file for analysis.