Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9a4e73bc622a03…

MALICIOUS

PDF

71.4 KB Created: 2021-02-28 18:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d05014f0c48607396aa70a64cbc8c978 SHA-1: b270f314ef0d0920a518749dcd799434d0298eb3 SHA-256: 4e9a4e73bc622a039c8cc77b3284657c31465b5d3c447790ccd50a1e9595617c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded links point to various PDF files on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/award?keyword=spectrum+tv+remote+control+user+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495997/normal_5ff39293e5bb4.pdfIn PDF document text
    • https://pabedowilopore.weebly.com/uploads/1/3/1/1/131163579/3b0b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_600f430ed1a27.pdfIn PDF document text
    • https://kazumole.weebly.com/uploads/1/3/1/4/131454435/kupifagu-pogizilugox.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/zitotudavisire_pevogixasafev_kejanemeki_genezikavil.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/zepawebelufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_6021079fe2052.pdfIn PDF document text
    • https://vaguvijag.weebly.com/uploads/1/3/4/6/134610999/javifirilive.pdfIn PDF document text
    • http://sufawevugut.mywebcommunity.org/fizarovukodinovub.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/how_to_love_book_summary.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/poxek.pdfIn PDF document text
    • https://gavurefeg.weebly.com/uploads/1/3/1/0/131070452/tolag.pdfIn PDF document text
    • https://fedaxowazujiwiz.weebly.com/uploads/1/3/4/0/134012387/wudidokixefexanol.pdfIn PDF document text
    • http://sijodegovawa.iblogger.org/chile_league_table_form_fixtures.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_603a5654249af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/sample_non_binding_letter_of_intent_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/avast_pro_antivirus_2019.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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 5344 bytes
SHA-256: 8225b4fd23c11ed629daebdd15699c58a6b26f428f76ef3c0f413bfcd41b466f
font_01_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 10040 bytes
SHA-256: 26724429b85b25d6cfd86fcd354d7871d47873925f0ca9ba9e62899e2694b590

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