Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7a73523c6ea2a2…

MALICIOUS

PDF

69.5 KB Created: 2021-04-02 05:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ee922fa07e8f63b518ca12816901e1a2 SHA-1: 44f36f2d029ebfaa23b5c016fdb55543f5a98f9d SHA-256: 9d7a73523c6ea2a283f7ebaa27eeb087dbc2233a638703162ca6256cb64fbb31
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/wix?keyword=famsa+usa+austin+tx PDF link annotation
    • http://rexexepunefa.22web.org/baal_shem_tov_stories.pdfIn PDF document text
    • https://loxoxonejuk.weebly.com/uploads/1/3/4/6/134684666/gupopuvuvoxotuzik.pdfIn PDF document text
    • http://xewuxufulizifu.22web.org/2579868028.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/kamoxomufogosiwevix.pdfIn PDF document text
    • http://xuvivok.22web.org/achilles_tendon_repair_rehab_exercises.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/43266543130.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/utility_bill_example.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/8545041.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/6460437.pdfIn PDF document text
    • http://zifasito.22web.org/jemejajopuvegotogivigemov.pdfIn PDF document text
    • http://buzofenag.22web.org/what_is_newsmax_tv_ratings.pdfIn PDF document text
    • http://lepasipun.iblogger.org/cateye_padrone_user_manual.pdfIn PDF document text
    • https://filewefoxu.weebly.com/uploads/1/3/4/7/134750201/xiwarufozonogir.pdfIn PDF document text
    • https://zapubotugor.weebly.com/uploads/1/3/4/6/134635013/jadilofixuze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukovixajetunex.epizy.com/cengage_integral_calculus_download.pdfIn PDF document text
    • http://gerufufa.epizy.com/42813172084.pdfIn PDF document text
    • http://sowawobajomo.rf.gd/corpus_christi_school_uniform_shop.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_a06551c459184974997c043733b11f57.pdf?index=trueIn PDF document text
    • http://gototura.myartsonline.com/apresentao_de_proposta_comercial.pdfIn PDF document text
    • http://nadadeze.epizy.com/57629358138.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_b4b8adcaeb41452680eb55b117cf29e0.pdf?index=trueIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_520cc87ce0b1456d8adeb00fc9e3b6b4.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_f9d059c23bc0400aa53e4478998dc967.pdf?index=trueIn PDF document text
    • http://kisomelug.rf.gd/24711919721.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_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 4728 bytes
SHA-256: 6f8480b396ae391a60fff369a48eddd125de0a3ee8944a833e6bf7c22b461473
font_01_sfnt_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 11956 bytes
SHA-256: fd00d64e49ffa93cce4c3f0c047c03e683fb113bafb8f398f4b557153f1e447c

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