Malicious PDF — malware analysis report

Static analysis result for SHA-256 a713325c6485869d…

MALICIOUS

PDF

87.5 KB Created: 2021-02-24 03:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ac3f7f9f01bc9d8fd74621ac874e60dc SHA-1: 97200666188d4b07b8c5eb3ee01ef286d23d24c3 SHA-256: a713325c6485869d554a4149193523126d7378338b32bba6c86cf573a3a7800a
134 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with one prominently displayed as a search result for 'pdf java books for beginners free download'. This URL, along with others, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading unwanted software or accessing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=pdf+java+books+for+beginners+free+download PDF link annotation
    • http://soldonlittleton.com/year_8_math_worksheets_with_answers03uwp.pdfIn PDF document text
    • http://strahauto.website/oxford_dictionary_with_translator_mod_apkfpquv.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/tadetoxaxawomi.pdfIn PDF document text
    • https://cdn.sqhk.co/tolademapati/ifgiyja/35251366316.pdfIn PDF document text
    • https://cdn.sqhk.co/fidakasari/hCIDaUT/36556515015.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/icsibCT/australian_cruise_careers.pdfIn PDF document text
    • http://return-0.com/bob_gear_revolution_flex_3.0_duallie_stroller43nit.pdfIn PDF document text
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/fosusiberadazuziw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452621/normal_601274907c461.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/cpuKhjh/who_is_the_infographics_show_writer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_600d50b008242.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://kutelitowolobe.rf.gd/35986670974.pdfIn PDF document text
    • http://kavotipuwevir.epizy.com/greythorn_primary_school_ofsted_report.pdfIn PDF document text
    • http://xebowuruno.epizy.com/gilanivegalego.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/european_guidelines_hepatorenal_syndrome.pdfIn PDF document text
    • http://niguroxutoginef.rf.gd/blogs_de_libros_gratis.pdfIn PDF document text
    • http://loxosufodu.epizy.com/40077356540.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 5508 bytes
SHA-256: b62b287de7dd0b0342114c1900face944da105783fc8158dc045ef68edebb181
font_01_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 11008 bytes
SHA-256: fd18726ea0d68d8bce824e48df1852fab5e5801e44c3c04cbe45b671800ba00f
font_02_sfnt_off00013ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED8 4964 bytes
SHA-256: 8a81dacf466ac6fee33731ee5150f61dcccb5cf3186dc3106a43d2778262541b

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