Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4a2ba4e55939a2…

MALICIOUS

PDF

73.9 KB Created: 2021-04-03 23:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e8898e5fc3b53e3f714a0cfb49b2b173 SHA-1: d978d30bce7d46d4da13bc8a9dd4bd8d82223f89 SHA-256: 3a4a2ba4e55939a27eb654b26b1c7f44e88efbdad9061d6d3de9c3f21ebe2a4e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 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.
  • 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://botokaw.ru/strik?utm_term=the+work+of+art+in+the+age+of+mechanical+reproduction+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5fd8cf0c5fbb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_5ff1762686cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_5fdbcaa1b5750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366408/normal_5ff19c4025f5f.pdfIn PDF document text
    • http://lastmarkt.ru/juicio_de_amparo_en_derecho_penalzo6t5.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/3dd28efadbc.pdfIn PDF document text
    • https://giwojagamepebew.weebly.com/uploads/1/3/4/8/134881383/e7b53e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_600468d8d0ca1.pdfIn PDF document text
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/4662607.pdfIn PDF document text
    • http://civiliscmq.online/2010_chrysler_town_and_country_for_salezjuqr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_1462f61e762b4238bb915eda0ab25c78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/longman_academic_writing_series_5_essays_to_research_papers.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_20c420df021f40f0854b14cd4e4a2999.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefovu/candido_voltaire_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/how_to_repair_a_lawn_mower_engine.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_65a40aac8fe0472aaebc00522f48cd1f.pdf?index=trueIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_f4e27f973e794adf95ae5bee7d881be9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/pete_the_cat_show_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/kakezapexasimoj.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_35e1208bddc74cc6a137f25868a5d65b.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_7176fe6e0c0248e3a310b55d51a19f5a.pdf?index=trueIn 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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 5496 bytes
SHA-256: ffec4b1726efcafebd4b5f3a3e098346adb00074e627f4e4edbed500176f6c9f
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 10780 bytes
SHA-256: 6a7ba25a9366aae83a555127b7d283fd55401c698eb807eb6ff11ec3b351a9e3

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