Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4faf96b76457f39…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 04:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d80e71a901bd0b7b206da4a0a95050d SHA-1: 853e0decc2b6aee84fe4b78501953a1b1a7d766b SHA-256: f4faf96b76457f39f8468fc684c8eb747e9eb934ec6826830e2edb56c513c78d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the links or perform malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=best+games+to+play+online+with+friends+on+phone PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b95a36991---jofazivasos.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/kegise.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/74502384780.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/dodukevexezem.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210902_075650_5357.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/dosewudozafitegerabi.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/53470181095.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/39210097627.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/dedukizimujop.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/60498152447.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/bozisotumamolowigixigaj.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/mopam.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/witomuzifud.pdfIn PDF document text
    • http://sdes.in/uploads/joresimadelofowiguwej.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/ridulitiferabemoregiz.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3d091984---lisugazaj.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/nasetenuxi.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/48515994730.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/donap.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/dexipixunijiromaloriz.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210916_044309.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/94296437493.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/gajesebigamujunukesiro.pdfIn PDF document text
    • https://foulardfotografando.it/file/rokiboxolemumuv.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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 18216 bytes
SHA-256: 3147e270ea641ab4a0d5c3861645ad863e7c791f33b70bbb6de82a4cdb12c832
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 11200 bytes
SHA-256: 6ea178086d16124fd37ff640e571a94898f3a33906d8f70c63ba43c94925da5d
font_02_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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