Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa812340ba75fc7…

MALICIOUS

PDF

72.5 KB Created: 2021-02-22 09:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1d73729ffc124cfd6d25a64049e1de72 SHA-1: 68f5233f7508b0d24e0267cd23140fed57bc95a3 SHA-256: eaa812340ba75fc7299e9b6f01efc526cf7c7882d6de9cf9802f2a89e6453bae
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests it is designed to lead users to malicious content. No scripts were extracted, but the document's structure and URL distribution are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/123?utm_term=how+to+reprogram+viper+alarm+system PDF link annotation
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/jalapabifa-sanedizov-bixamisiz.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/2216497.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/nobexumaximobusikir.pdfIn PDF document text
    • https://cdn.sqhk.co/vepanoxubere/cjO2Od5/funny_farm_names_stardew_valley.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5ffc4db119f0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420470/normal_5fe4e511386fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_601c96da2063f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://texatutegelemov.rf.gd/born_free_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/69863135382.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/45370964035.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/44973196828.pdfIn PDF document text
    • http://tofezininas.rf.gd/avid_media_composer_first_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/is_el_pollo_loco_chicken_healthy.pdfIn PDF document text
    • http://fepapasofefo.epizy.com/badoo_apk_for_pc.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_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 5356 bytes
SHA-256: f7211404f68701d3fce3cdb2bb5c1c138c6f727ec5090b78c11d7af71b51bf59
font_01_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 10568 bytes
SHA-256: 4788e933132027a33df9ad14d9c9cd6d69899187c935d6c567474ec88f91845b

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