Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ef21ce05a3987a…

MALICIOUS

PDF

73.8 KB Created: 2021-02-19 18:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 475e5ed8ea8d8ec69cfce05f66f20e80 SHA-1: 92c60514896cf22f32f2e117d8226be0dbd3f6bb SHA-256: 24ef21ce05a3987a5e75639f4443a7cb33c498fe5cfdf8c8820aeb42f9db7e7a
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 0.9999

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://leonvi.ru/123?utm_term=what+is+the+definition+of+chemical+composition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417318/normal_602a3f29da2d4.pdfIn PDF document text
    • https://pebogifi.weebly.com/uploads/1/3/1/4/131438694/tebemakito.pdfIn PDF document text
    • http://powerpoint4you.ru/75573476630xkum5.pdfIn PDF document text
    • http://znatural.space/xuxubizanuro1bq27.pdfIn PDF document text
    • http://shoop-fr.ru/inductive_and_deductive_method_of_teachinginlix.pdfIn PDF document text
    • http://daimontimur.org/como_descargar_snipers_vs_thieves_para_pcvniyu.pdfIn PDF document text
    • https://butapakenora.weebly.com/uploads/1/3/1/8/131871909/9081f0.pdfIn PDF document text
    • http://vvinorama.fun/tebujigowujisogujch78x.pdfIn PDF document text
    • https://jisuxewaxem.weebly.com/uploads/1/3/1/8/131857679/9353630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446765/normal_5fcd0a0b0295f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464707/normal_5fd86e87acf0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5ff71821b97e4.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/tufujifinobiro/bixijomanenufowuwawoz.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/amounts_owed_to_creditors_are_reported_as.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/bsc_nursing_entrance_exam_format.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/48009214037.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/apostila_c_caelum.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/jugufukomizovod.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_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 5312 bytes
SHA-256: e941c9963d5e37d3d9464a7e85293f0558f5fe522da1eba48925811711002645
font_01_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 10708 bytes
SHA-256: 852bfc85ecce2f3de5375b5f18d5c420b59f196d9e169be90f1429b4b412d502

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