Malicious PDF — malware analysis report

Static analysis result for SHA-256 976a04a73d512742…

MALICIOUS

PDF

78.8 KB Created: 2021-04-02 03:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 474b2ae6fd5a28e0d35dd668fe2a3621 SHA-1: 2738c0a2c88f32b1e8f742659cbf38c1020dd5f3 SHA-256: 976a04a73d512742b2d072df69533816cff2116128accb071d13a6bc67c2722d
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. The presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://maypoin.ru/award?keyword=adobe+split+and+merge+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454808/normal_5ff9a8199a429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468838/normal_6015235bedd95.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/applebee_s_drink_menu.pdfIn PDF document text
    • http://penageli.getenjoyment.net/tifakevegubar.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/povox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_602d497576d16.pdfIn PDF document text
    • http://palovedu.22web.org/como_atender_la_boveda_espiritual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_5fe7d8357ab55.pdfIn PDF document text
    • http://xevedudox.sportsontheweb.net/14794003056.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/xoxikogisobajosetedakonul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wumokobaleto.epizy.com/62895667729.pdfIn PDF document text
    • http://duxunidebinajus.epizy.com/lejejekumo.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/aikido_weapons_techniques.pdfIn PDF document text
    • http://dibirat.rf.gd/gujazimetaladekapafeme.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/mallu_bhatti_vikramarka_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/xapitimotaxegojof.pdfIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/65212622609.pdfIn PDF document text
    • http://kiweleterov.epizy.com/51154425510.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/warrior_dungeon_leveling_guide_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/47185719520.pdfIn PDF document text
    • http://vovajixavago.epizy.com/7th_grade_math_word_problems_with_answers.pdfIn PDF document text
    • http://povusesa.rf.gd/free_offline_niv_bible_download.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_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 5580 bytes
SHA-256: 4a09ffe232749e26e906b31655aadfb1d59e87472c1210011b7a0e0df98659ce
font_01_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 22548 bytes
SHA-256: 5a50a7d4b2bacfd6909484c86dbf288b0524a3df11dd5137a4c663345ce40c29

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