Malicious PDF — malware analysis report

Static analysis result for SHA-256 e991b22648490f5b…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 12:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 562aa92c40d87c1d3325d0088a848cd8 SHA-1: fda9099823fa481034423495d9d75318e1fc8047 SHA-256: e991b22648490f5bd65075358b9e13bd92e05a174fb18bea6a084d1c9fd0ef05
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Multiple external URLs are present, suggesting the PDF acts as a lure or downloader for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=chinese+android+tablet+manufacturers PDF link annotation
    • https://chatsystem.site/js/ckfinder/userfiles/files/30254306273.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/patajovima.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/76276459275.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/povusamaki.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/17150461030.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/16727973016.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/tibekimidenepizesuboleza.pdfIn PDF document text
    • http://rilta.net/userfiles/files/wazakujibalimitexefi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614679cd1bcd7---xovovamawabosazilalibane.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/87645272660.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/likoxilavikafomu.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210904045435.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/zikivedumofabakizosetozu.pdfIn PDF document text
    • http://mextro.de/upload/files/jiwivuvirizoj.pdfIn PDF document text
    • https://mediaskills.rs/files/gubapelivakutanawasijekam.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/nafokatav.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/lixubujiriberudegetote.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458e1412043---64243242584.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/42556710785.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/lupepozaxewinojam.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/simomujelemetenor.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/bixizorizebibukuzibix.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/53935638259.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/temopopezupafulubiwebapu.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_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 11012 bytes
SHA-256: 4e429fc247336634bab1e1da0ba967e87483029dedafe0d209bd4c9204636ae7
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 18116 bytes
SHA-256: 32ebf2d6994412f70bc22ea541fc33003f85354b0720a7240a5ed3a136015853