Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2d991c78533160…

MALICIOUS

PDF

79.5 KB Created: 2021-02-28 14:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 919888aa8410d872dde829ea1d8281a6 SHA-1: e33bb3580e4e43a48aca45caec4e6bb9c1bacbaa SHA-256: 0e2d991c785331607c1bc13f47ff457406213df750b86a0112501497732b9dea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=craig+jones+slipknot+unmasked PDF link annotation
    • https://cdn.sqhk.co/kawinojos/fiii8ib/hachi_japanese_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxasedazu/gjhjbw1/fireman_costume_size_3t.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/jgNmAZ5/dota_2_windranger_arcana_wallpaper.pdfIn PDF document text
    • http://useporte.xyz/honda_fit_2007_sport_modexmtq7.pdfIn PDF document text
    • http://souve.me/32691415076tz8bz.pdfIn PDF document text
    • http://storeplus.pro/wofuwoziwudopgbaso.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/giagehi/goraxejewanemigit.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/8447572788.pdfIn PDF document text
    • http://stat-index-co.com/jutifojalakimaxuxu7exf6.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/gigfrhh/rofagirokurulog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/adobe_illustrator_cs6_tutorials_advanced.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/33488554057.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/45736090356.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/vovikinazowuj.pdfIn PDF document text
    • http://jimarol.myartsonline.com/everstart_jump_starter_750_amp_charge_time.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 5324 bytes
SHA-256: 2ad1e53d94154cd08422f9baf4d3b6758d587d01db7db107e8e9a48d06a25736
font_01_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 11324 bytes
SHA-256: 873fd24fa1639a1d044b2aee1765dbdc1929842c384a6d346f25d09fe96b382a

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