Malicious PDF — malware analysis report

Static analysis result for SHA-256 2928593249d772d0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 03:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ffd4f4367f022a09588600f868314d7d SHA-1: 460bf5c1bf4a266c1ec100201c386f1eef5aeacb SHA-256: 2928593249d772d06d188d4f39aa0549079ba53c034410f37011cbf76d6d3a07
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and numerous links suggest an attempt to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/fimapifajiwumebube.pdf In PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/77659583935.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/kidixogimixike.pdfIn PDF document text
    • http://erex.hu/upload/file/xiwugumafoloxat.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210914_0284E959114891C3.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/10077405681.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/450264008.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/31689201705.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/36286377198.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109111338232295.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/90224841398.pdfIn PDF document text
    • http://asid.rw/userfiles/file/72685482.pdfIn PDF document text
    • http://seto.cz/uploads/51538906164.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/zalupepemobipuw.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/fewarubi.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/nizasubumibar.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c3d9c3498fe0e72f5cbd2fa03166664d/91893976754.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/vowuv.pdfIn PDF document text
    • http://lachina.cn/upload/file/22810427879.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/34006361313.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/xonegedilupumoxawifodapir.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/xigiwitofovapovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dream+league+soccer+2018+download+apkPDF link annotation
    • 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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 16980 bytes
SHA-256: 3d350a5ef8b63d37dfef2dbefda357fe914fbb7b2a97f1fb1ae8a28177389e70
font_02_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 11448 bytes
SHA-256: 806703f6ad588b646dd394617963dd5aa6f36b1fe916cadb8487f30efd948a52

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