Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd58e400d4e45a7b…

MALICIOUS

PDF

72.7 KB Created: 2021-03-02 01:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3f8343a562c8eba6b0bda12bac19c75d SHA-1: e9c2471b015d2e2ddea9bd9037259680e0e64324 SHA-256: dd58e400d4e45a7bdaf6edf959302a8289899ec1faac0d25037dbc83899f9654
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=nitro+car+stereo+manual PDF link annotation
    • http://lojapidabud.mypressonline.com/o_alquimista_paulo_coelho_audiolivro.pdfIn PDF document text
    • https://getariko.weebly.com/uploads/1/3/4/9/134904460/zewekavadefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_601b108b834fd.pdfIn PDF document text
    • https://tuzuvujejoru.weebly.com/uploads/1/3/4/4/134442534/nafezotu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5fc9178228c4d.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/1557812.pdfIn PDF document text
    • https://tovibimatajo.weebly.com/uploads/1/3/5/9/135963052/8080983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5fe801f0512bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_601f37da0edc3.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/vezakujo.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/errores_tipo_1_y_2_estadistica_inferencial.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/82702055592.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/13078367572.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palelezugob.onlinewebshop.net/how_to_attach_dishwasher_bracket_to_granite.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/dell_optiplex_gx620_drivers_download_for_windows_7.pdfIn PDF document text
    • http://gajopule.myartsonline.com/black_and_decker_4_slice_toaster_oven_manual.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/synonyms_worksheet_for_grade_3.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/77603131562.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_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 4916 bytes
SHA-256: 5a328aec21cef802b84c4b2693c1706628c5c6ba43fddbc547469d103f9eae4a
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10424 bytes
SHA-256: 502bb4a44b54a4990053263d122bfa7980aa5c9ef024e400022e1ed959521ea3