Malicious PDF — malware analysis report

Static analysis result for SHA-256 458144a4d93c24c2…

MALICIOUS

PDF

66.1 KB Created: 2021-02-26 13:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 18a8f628885fd9bba5c6c4492570ddaa SHA-1: 8933718c47b960b615e7db9a16803a3c63d74745 SHA-256: 458144a4d93c24c259fa59e1207c4ab584c14a60f1adeea564fc946b7fa003e2
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=how+to+edit+gif+image+text+online PDF link annotation
    • http://usersonlineguardingsettings.site/dan_brown_angels_and_demons_summarytb9xo.pdfIn PDF document text
    • https://zizetorusiwewiw.weebly.com/uploads/1/3/5/9/135990502/kiwibix.pdfIn PDF document text
    • http://senigudalow.iblogger.org/57203748199.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/hy9idjh/symptoms_lethargy_headache_nausea.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/lol_patch_11.3_nerfs.pdfIn PDF document text
    • http://macsk.space/roxamim56zse.pdfIn PDF document text
    • http://kipeliri.22web.org/how_to_research_qualitative_data.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/ig7ebp8/tawev.pdfIn PDF document text
    • https://jadekida.weebly.com/uploads/1/3/4/3/134349878/5165520.pdfIn PDF document text
    • http://kulinar2020.site/gidemizalexejafojimikuvidgm1z0.pdfIn PDF document text
    • https://najunewuzerus.weebly.com/uploads/1/3/1/4/131408250/942a8ce524352.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/dsgijg6/koxafokupedit.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/XYwgiie/gatwick_airport_strike_august.pdfIn PDF document text
    • http://katipef.medianewsonline.com/fisher_price_outdoor_swing_replacement_straps.pdfIn PDF document text
    • http://matras-24.ru/juvevijuvezawutetugopitujxq5o.pdfIn PDF document text
    • https://cdn.sqhk.co/neliwuwo/bzzW4ic/kimole.pdfIn PDF document text
    • http://jazonezamivoka.22web.org/how_to_learn_excel_formulas_and_functions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://budivisatenebo.rf.gd/51105395734.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/62883014652.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/xudodonigemakikurenamo.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/amazon_music_to_device.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_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 5076 bytes
SHA-256: c722399c6c0bdd1200f8218f64403ac78d33714153da1a1e6692cfa63e2305e0
font_01_sfnt_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 9784 bytes
SHA-256: 229894542edb0572501f51a6da1f5b937599ee9ab34040fbb422b7f4b23fdaa8

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