Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13cc6e78693e71e…

MALICIOUS

PDF

66.3 KB Created: 2021-03-14 02:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 22cb3917edd2dd1c9cc25c004722c1cd SHA-1: 10f5b9d101e5e67c06f4e0e038ad82167943149b SHA-256: a13cc6e78693e71e692693b779dc66a6b4432cf2ed5042b32a54893792acd34c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://midufefew.ru/strik?utm_term=me+gozare+en+tu+presencia+jehova PDF link annotation
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/susududuzowig_sidiraleji_xumiriwopaxubo.pdfIn PDF document text
    • https://sefuxogam.weebly.com/uploads/1/3/4/4/134466031/3074679.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/gdyijhi/convert_pounds_to_kg_equation.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/whibhi4/wulujedofesiretilip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453335/normal_601833591bb86.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/fVghagg/jumpstart_kindergarten_1998_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449004/normal_6007dcb5cf3e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5ff5159b73f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_600d26b28b655.pdfIn PDF document text
    • https://cdn.sqhk.co/fekoguwiwu/Che4hfC/grandparents_day_quotes_messages.pdfIn PDF document text
    • https://ribekafov.weebly.com/uploads/1/3/4/7/134761657/nidutilegotazome.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/directiva_inicio_de_ao_escolar_2019.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/zozofufulolig/63239752724.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/barefoot_investor_2017.pdfIn PDF document text
    • http://bexumasifawej.epizy.com/formal_grievance_procedure_definition.pdfIn PDF document text
    • http://punotonaduwize.atwebpages.com/definicion_de_espacio_en_arquitectura.pdfIn PDF document text
    • http://vefovax.rf.gd/merewesusuv.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/yearly_calendar_template_2019_excel.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_off0000c650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC650 5356 bytes
SHA-256: 1f3a443d880bc003dd29788a0ba822d94b11f8df698b28c11b2d0c5d2458918a
font_01_sfnt_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 10900 bytes
SHA-256: 0548e97f7923793f2cf3d3051f336c7d8e70059bfac5f0bf51efa210e6223837

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