Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5888a3e5cdbe0a6…

MALICIOUS

PDF

89.0 KB Created: 2020-11-13 20:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c3e6b62f0aad48336c4aeaeae7f6f555 SHA-1: 2fc2284e0cf974fff9721541d7e94635e342c635 SHA-256: f5888a3e5cdbe0a666e3d87c4a05f8947de2a30270be842b0d383f4fb066dec7
214 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=que+es+fermentacion+lactica In PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/lomabulasev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5f945b8c07d24.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/d82ed0f5.pdfIn PDF document text
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/musutixitavik_ganiwe_kanuraza.pdfIn PDF document text
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/4c39eb8e5f3.pdfIn PDF document text
    • https://degujipimisa.weebly.com/uploads/1/3/1/4/131453395/zopeka.pdfIn PDF document text
    • https://sudigosapo.weebly.com/uploads/1/3/4/4/134456465/7476958.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/riviwixu.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/busutafitufe/esperanza_rising_test_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/carol_of_the_bells_choir.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/pit_boss_pro_820_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/billy_joel_miller_park_opening_act.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/reruvivitig.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 5088 bytes
SHA-256: 9078da4f395cfb239354e220ecb5ec3ee89081f39998b2850a30655bc0c72cbd
font_01_sfnt_off000118cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CD 12164 bytes
SHA-256: 56365333a910395978f747a18f755605f1a61cdfba8eed18d3774fef50ac3b8c
font_02_sfnt_off000140be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BE 16080 bytes
SHA-256: e8a2a40c81204f68d188656ee186563bb41cec9665ac8bf1c139965098426a80

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