Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6ec88881dba2d5…

MALICIOUS

PDF

67.8 KB Created: 2021-09-29 09:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 191e8cca2a548e31933ce247026e36a0 SHA-1: 16566cb81f5a23ecdad8000ea3cfa0cca3be0771 SHA-256: 1d6ec88881dba2d50373235bf2948ab343e5717e1d203e766eac8d0bac657b63
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating a likely phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a large number of links pointing to potentially disposable domains, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://queure.ru/uplcv?utm_term=dark+web+hacking+apk PDF link annotation
    • https://hotelcorona.ro/files/38455920753.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/56281572951.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/77826574362.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/ditanirezosufos.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/26755613582.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/kanavezomidetabedaka.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210920205952.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/97404432045.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/tikadijid.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/63992992045.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/53495133346.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/tupukodoviwojob.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/99819967149.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/gopix.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/45999297538.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/beweleweg.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/63200175161.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/17391940725.pdfIn PDF document text
    • https://fptica.ru/images/file/wizidelowedavekibowor.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210925200641.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210929_0D22FE31D709C163.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/24944867309.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_off0000ab7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB7D 14800 bytes
SHA-256: da8f1855d1a92a56cb9cd5ec8c690390d3262086ca95d151d4344dbe30bced5e
font_01_sfnt_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 10540 bytes
SHA-256: 33154a2f71441513e516b7d4de9450ef094b95f1758cf3c59548235593f0d9a3

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