Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6764b80578ce4a9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 21:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e30a44c16580bbe37710fae0b90a877d SHA-1: 8153b5a43e4618876b60aafec3683960a66a00fa SHA-256: a6764b80578ce4a91033864f1f52f40e9b9749b1454070ff31a30359f525e817
174 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 facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://garglob.ru/uplcv?utm_term=telecharger+jeux+super+mario+android PDF link annotation
    • https://xosobacninh.vn/webroot/img/files/91312179643.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/lidalunibowosazeluvomepe.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/23960152975.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/50023486597.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131914f0e7ac---tixirazokolavulobikafa.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/9038014764.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/41761249330.pdfIn PDF document text
    • https://airxps.com/userfiles/files/55679654561.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/tivozasefogotawunefose.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/86040374904.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/wamamijaninug.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/94448242221.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/60144160659.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109060920172878.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/gupumipaxataruxizofari.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/1707306627.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/77928975869.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/6032577535.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/nazezidi.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/jidef.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210921072204.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1bb8639f3---94455144697.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/rarobiferisasog.pdfIn PDF document text
    • http://giadinhlaurensoIn macro / runtime command snippet
    • 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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 11160 bytes
SHA-256: 3ad0ebf4d9670772e35253f25a2f2f8820ac6984db0345dbb9a3d9e5af168eff
font_01_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 20608 bytes
SHA-256: 87623fe24938bb3f163c6e707172929f960acbe113fbb8b6d89037f4e7bba567