Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78d5ee595bb6d20…

MALICIOUS

PDF

104.6 KB Created: 2021-04-18 10:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 954c28cc1657ed30424eeec8dd85d45e SHA-1: 23a4f0b2505c550454a40e2a9d2b9263b64a3f99 SHA-256: e78d5ee595bb6d206dc4e38fe507ef4730e6b223032c4390b686ab2c820bbc10
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'best jackie moon quotes', suggesting a lure to disguise the malicious intent. The presence of embedded URLs and the link farm nature strongly indicate an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=best+jackie+moon+quotes PDF link annotation
    • http://ouily.xyz/jopudosefanigodevizatanzdani.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/aprendizajes_clave_educacion_basica_2020.pdfIn PDF document text
    • http://gopagafab.medianewsonline.com/muwumasuvibuxifa.pdfIn PDF document text
    • http://ita-bio.fun/gisavejikafalupefut7toih.pdfIn PDF document text
    • https://natevotid.weebly.com/uploads/1/3/4/7/134773148/ridunin.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/27092332751.pdfIn PDF document text
    • http://prizinsta24.online/78646391740wqdyb.pdfIn PDF document text
    • https://bewanabexujafo.weebly.com/uploads/1/3/6/0/136050633/6432620.pdfIn PDF document text
    • http://vinorama.fun/call_recorder_free_videoizzul.pdfIn PDF document text
    • http://vsedlyatebya.xyz/what_were_the_colonists_reasons_for_writing_the_declaration_of_independenceptqx5.pdfIn PDF document text
    • https://jasedulenenude.weebly.com/uploads/1/3/5/3/135328633/fe3faa.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/disadvantages_of_joint_stock_company.pdfIn PDF document text
    • https://jijixedo.weebly.com/uploads/1/3/1/3/131398351/3ee0d7d8a.pdfIn PDF document text
    • http://detonic-ordina.website/zezetiviwevotifose8qaio.pdfIn PDF document text
    • http://walkover.me/16411664841wfob5.pdfIn PDF document text
    • http://nikaold.site/sunujivovanenukowekulugef4fapf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xateguguf.epizy.com/60453844467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0643aa62-e0a8-4fbb-9bdd-de7b5c44fb8c/risirumewojurematiw.pdfIn PDF document text
    • http://sugigujetobil.epizy.com/32574941265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad9928b-2586-4cf1-b626-c623615ac869/rosemount_1056_troubleshooting.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A34 5132 bytes
SHA-256: d85bcf73848753ddc450616c5215ae5358ed777157101fd33e22e20c82c222ac
font_01_sfnt_off00015baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAA 10588 bytes
SHA-256: e2a14fdb5281d660401f1b4e5b699ccbfb677ed9a7310301b80f737aa750e068
font_02_sfnt_off00017fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FEE 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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