Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59325aa05608cd6…

MALICIOUS

PDF

76.5 KB Created: 2021-02-18 01:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 07238df1c0809fe0651ba067b658201a SHA-1: 02105dbfc2bc8ebd536f4aad1cd173f2bed589ee SHA-256: b59325aa05608cd643576ecd797ca9d07dda791a13560f5c47858d60fa1c244b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on Weebly subdomains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

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 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.
  • 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://crophysi.ru/strik?utm_term=wireless-n+wifi+repeater+setup+windows+7 PDF link annotation
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/tukasafo.pdfIn PDF document text
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/xavejuwukuzo-limeminesin.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/kenosotelun.pdfIn PDF document text
    • https://rigupanikoma.weebly.com/uploads/1/3/5/2/135297472/kitemazoxutanexilola.pdfIn PDF document text
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/ffbcc74c.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/633575bfda07ab2.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/4613262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444874/normal_5ffe74a24380c.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/2761ef4c8a.pdfIn PDF document text
    • https://punufepezakuba.weebly.com/uploads/1/3/2/7/132740965/ribosorigo.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/1731076.pdfIn PDF document text
    • http://indital.fun/taxinikon2706.pdfIn PDF document text
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/sisiwanerezudubi.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/9000052.pdfIn PDF document text
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/4887508.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/1621902.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/lowuwofuxali/paturugarurugukemoxowotaw.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/proforma_invoice_gst_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/gratis_achtergronden_pc_en.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/nimuxomonavexetu.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_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 5252 bytes
SHA-256: 68a0a94f36a25d1fb9201e2e67b585d3127654f6e733ad30ac2e4b1dd77ff306
font_01_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 10100 bytes
SHA-256: 7386b1c84e4e6d3fa691ff2729697dd4a9b64c6dd6841716ec4de75bb9ed9cff

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