Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6077b9671312b46…

MALICIOUS

PDF

73.6 KB Created: 2021-03-03 04:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e953ee44b5d70cb1c4f748eabf2af69c SHA-1: 0d58fe008ed2b6dc0322caae82d27a845af29aa1 SHA-256: a6077b9671312b460307b560399761ca7c458ecae1b52f80db8eeb088a2d8e30
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to lead users to malicious sites, likely for phishing or malware delivery.

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://leonvi.ru/wix?keyword=btd2+cain+endings PDF link annotation
    • https://jofufibiwew.weebly.com/uploads/1/3/5/3/135347649/wunereka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5fdd9a1c5c7a5.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/2552027.pdfIn PDF document text
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/wakipevameneze.pdfIn PDF document text
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/f7f7af08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482631/normal_5ff7a8f5a6f30.pdfIn PDF document text
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/kumavefoxujowoxirowo.pdfIn PDF document text
    • https://vutavapurazamo.weebly.com/uploads/1/3/4/6/134643269/1d1a2dbcdc4b.pdfIn PDF document text
    • http://digerutejonoju.22web.org/agile_software_development_martin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobuxex.epizy.com/catalogue_toto_2019.pdfIn PDF document text
    • http://xuwolerapole.epizy.com/baxafeterebenekulejuduv.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/75378802604.pdfIn PDF document text
    • http://gigavolaxo.epizy.com/liborarilepigif.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/crazy_frog_dance_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/29727203267.pdfIn PDF document text
    • http://suwapazuxesara.epizy.com/biotransformation_nursing_meaning.pdfIn PDF document text
    • http://pokezuturev.rf.gd/arcsoft_showbiz_5_activation_code.pdfIn PDF document text
    • http://tukozadagafewan.rf.gd/endorsement_form_insurance.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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 5160 bytes
SHA-256: e9165ac5a41c4fa7a12c3e5e9cefd51d4509378f599b3c3d8f47aaec234c8cf8
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 10212 bytes
SHA-256: 88c2cf83c205839a4dd6b1d134db95190f83d554b41b410b8d382cd5b9095627

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