Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd4d9c9b513e8c4…

MALICIOUS

PDF

86.9 KB Created: 2021-04-04 18:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e568ae365b07e73b5626ccd19127e9bb SHA-1: 5bfc1a9fcb0ba38323c049a497155ee58dbc099e SHA-256: 4fd4d9c9b513e8c4679b7bb63755e3c5ded8c10fa3304f0b1439eefd89e94d06
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/aws?utm_term=principles+of+polymerization+odian+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447087/normal_5fdc73c01d99d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445737/normal_5fd1b4844afa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_600cb89170d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_600ebc22cbd6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_5fd826edc29b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_6051539ede7a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480403/normal_5ffcb5642be63.pdfIn PDF document text
    • http://xubajaw.iblogger.org/business_model_template_word_document.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_6068e96e9244f.pdfIn PDF document text
    • https://cdn.sqhk.co/lukuvekeliki/mP45eAM/72451816442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_600de56b2151f.pdfIn PDF document text
    • https://cdn.sqhk.co/supekokabe/hiDT6jg/nuzuvatijuluviwuxibiwuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_604b188fdc951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_60111429c8a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_6023b7fae8997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_6028f31945d36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupiwepe.epizy.com/year_planner_template_2019_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/bassaleg_school_sixth_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/73714393334.pdfIn PDF document text
    • http://pufufatorum.epizy.com/pdf_file_to_jpg_converter_free_download.pdfIn PDF document text
    • http://fegifujeviba.epizy.com/choushinsei_flashman_sub_indo.pdfIn PDF document text
    • http://losalevova.epizy.com/axis_of_symmetry_worksheet_tes.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
    • 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_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 5452 bytes
SHA-256: d533f3c6d698273dbb3f447641e9719cd7125f3e3137f7cc390df03f51ef108e
font_01_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 11136 bytes
SHA-256: fe9e0f6bc0de23e554fd92355b903df9bce15d90dc70efb0ab9586232d452032
font_02_sfnt_off000138c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C9 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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